Dr. Christian A. Hummel Profile

Dr. Christian A. Hummel

at European Southern Observatory

SPIE Involvement:

Author

Publications (40)

Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

VLTI status update

Xavier Haubois, Antoine Mérand, Roberto Abuter, Juan Pablo Araneda, Fuyan Bian, Pierre Bourget, Paul Bristow, Pablo Burgos, Françoise Delplancke-Ströbele, Roderick Dembet, Juan Pablo Gil, Andreas Glindemann, Frédéric Gonté, Patricia Guajardo, Norbert Hubin, Christian Hummel, Heidi Korhonen, Aaron Labdon, Johann Kolb, Johan Kosmalski, Sylvestre Lacour, Claudia Paladini, Laurent Pallanca, Luca Pasquini, Isabelle Percheron, Miguel Riquelme, Thomas Rivinius, Eleonora Sani, Linda Schmidtobreick, Peter Scicluna, Markus Schöller, Nicolas Schuhler, Konrad Tristram, Markus Wittkowski, Julien Woillez, Gérard Zins

Proceedings Volume 12183, 1218306 (2022) https://doi.org/10.1117/12.2635405

KEYWORDS: Telescopes, Astatine, Observatories, Adaptive optics, Spatial resolution, Polarization, Polarimetry, Optical spheres, L band, Data archive systems

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Evolution of VLTI science operations: supporting imaging, astrometry, and monitoring types of interferometric observations

Markus Wittkowski, Giacomo Beccari, Thomas Bierwirth, Stéphane Brillant, Paula Correia dos Santos, Olivier Hainaut, Xavier Haubois, Christian Hummel, Stéphane Marteau, Antoine Mérand, Steffen Mieske, Sangeeta Mysore, Claudia Paladini, Ferdinando Patat, John Pritchard, Michael Pruemm, Marina Rejkuba, Konrad R. Tristram

Proceedings Volume 12183, 121830X (2022) https://doi.org/10.1117/12.2627302

KEYWORDS: Interferometry, Stars, Observatories, Turbulence, Telescopes, Calibration, Adaptive optics, Interferometers, Efficient operations

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

VLTI status update: tapping into a powerful second-generation instrumentation

Xavier Haubois, Roberto Abuter, Emmanuel Aller-Carpentier, Jaime Alonso, Juan Beltran, Jean-Philippe Berger, Pierre Bourget, Paul Bristow, Luis Caniguante, Bruno Chazelas, Claudia Cid, Ralf Conzelmann, Angela Cortes, Pascaline Darré, Alain Delboulbé, Françoise Delplancke-Ströbele, Diego Del Valle, Roderick Dembet, Reinaldo Donoso, Christophe Dupuy, Sebastien Egner, Frank Eisenhauer, Lorena Faundez, Eloy Fuenteseca, Robert Frahm, Daniel Gaytan, Juan Pablo Gil, Andreas Glindemann, Frédéric Gonté, Jaime Gonzales, Patricia Guajardo, Thibaut Guerlet, Sylvain Guieu, Pablo Gutierrez, Pierre Haguenauer, Pierre van der Heyden, Stefan Huber, Norbert Hubin, Christian Hummel, Lieselotte Jochum, Laurent Jocou, Jean-Paul Kirchbauer, Johann Kolb, Johan Kosmalski, Peter Krempl, Sylvestre Lacour, Jean-Baptiste Le Bouquin, Julien Leclercq, Jean Louis Lizon, Bruno Lopez, Yves Magnard, Anthony Meilland, Alexander Meister, Antoine Mérand, Steffen Mieske, Thibaut Moulin, Juan Osorio, Jürgen Ott, Claudia Paladini, Laurent Pallanca, Marcus Pavez, Luca Pasquini, Célia Pelluet, Isabelle Percheron, Lorenzo Pettazzi, Andrés Pino, Sébastien Poupar, Andrés Ramírez, Javier Reyes, Miguel Riquelme, Thomas Rivinius, Sylvain Rochat, Fernando Salgado, Markus Schöller, Nicolas Schuhler, Pavel Shchekaturov, Christian Stephan, Marcos Suarez, Alain Smette, Richard Tamblay, Mario Tapia, Konrad Tristram, Guillermo Valdes, Christophe Verinaud, Markus Wittkowski, Julien Woillez, Gérard Zins

Proceedings Volume 11446, 1144606 (2020) https://doi.org/10.1117/12.2561486

KEYWORDS: Telescopes, Adaptive optics, Space operations

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Proceedings Article | 9 August 2016 Paper

Paper

Regaining the FORS: making optical ground-based transmission spectroscopy of exoplanets with VLT+FORS2 possible again

Henri M. Boffin, Elyar Sedaghati, Guillaume Blanchard, Oscar Gonzalez, Sabine Moehler, Neale Gibson, Mario van den Ancker, Jonathan Smoker, Joseph Anderson, Christian Hummel, Danuta Dobrzycka, Alain Smette, Gero Rupprecht

Proceedings Volume 9908, 99082B (2016) https://doi.org/10.1117/12.2232094

KEYWORDS: Exoplanets, Exoplanets, Spectroscopy, Spectroscopes, Space telescopes, Telescopes, Stars, Planets, Prisms, Clouds, Atmospheric physics

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Proceedings Article | 9 August 2016 Paper

Paper

The orbit of the mercury-manganese binary 41 Eridani

Christian Hummel, Markus Schöller, Gilles Duvert, Jean-Baptiste Le Bouquin, Swetlana Hubrig

Proceedings Volume 9907, 99070Q (2016) https://doi.org/10.1117/12.2231859

KEYWORDS: Stars, Interferometry, Mercury, Manganese, Spectroscopy, Calibration, Visibility, Near infrared spectroscopy, Surface conduction electron emitter displays, Photometry

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Proceedings Article | 4 August 2016 Paper

Paper

An overview of the mid-infrared spectro-interferometer MATISSE: science, concept, and current status

A. Matter, B. Lopez, P. Antonelli, M. Lehmitz, F. Bettonvil, U. Beckmann, S. Lagarde, W. Jaffe, R. Petrov, P. Berio, F. Millour, S. Robbe-Dubois, A. Glindemann, P. Bristow, M. Schoeller, T. Lanz, T. Henning, G. Weigelt, M. Heininger, S. Morel, P. Cruzalebes, K. Meisenheimer, R. Hofferbert, S. Wolf, Y. Bresson, T. Agocs, F. Allouche, J.-C. Augereau, G. Avila, C. Bailet, J. Behrend, G. van Belle, J.-P. Berger, R. van Boekel, P. Bourget, R. Brast, J.-M. Clausse, C. Connot, R. Conzelmann, G. Csepany, W. Danchi, M. Delbo, C. Dominik, A. van Duin, E. Elswijk, Y. Fantei, G. Finger, A. Gabasch, F. Gonté, U. Graser, F. Guitton, S. Guniat, M. De Haan, P. Haguenauer, H. Hanenburg, K.-H. Hofmann, M. Hogerheijde, R. ter Horst, J. Hron, C Hummel, J. Isderda, D. Ives, G. Jakob, A. Jasko, P. Jolley, S. Kiraly, J. Kragt, T. Kroener, G. Kroes, S. Kuindersma, L. Labadie, W. Laun, C. Leinert, J.-L. Lizon, C. Lucuix, A. Marcotto, F. Martinache, G. Martinot-Lagarde, N. Mauclert, L. Mehrgan, A. Meilland, M. Mellein, S. Menardi, A. Merand, U. Neumann, E. Nussbaum, S. Ottogalli, R. Palsa, J. Panduro, E. Pantin, I. Percheron, T. Phan Duc, J.-U. Pott, E. Pozna, R. Roelfsema, G. Rupprecht, D. Schertl, C. Schmidt, M. Schuil, A. Spang, J. Stegmeier, N. Tromp, F. Vakili, M. Vannier, K. Wagner, L. Venema, J. Woillez

Proceedings Volume 9907, 99070A (2016) https://doi.org/10.1117/12.2233052

KEYWORDS: Mid-IR, Interferometry, Telescopes, Signal detection, Sensors, Stars, Spectral resolution, Fourier transforms, L band, Cameras

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Proceedings Article | 3 August 2016 Paper

Paper

VISIR upgrade overview: all's well that ends well

Florian Kerber, Hans Ulrich Käufl, Konrad Tristram, Daniel Asmus, Pedro Baksai, Nicola Di Lieto, Danuta Dobrzycka, Philippe Duhoux, Gert Finger, Christian Hummel, Derek Ives, Gerd Jakob, Lars Lundin, Dimitri Mawet, Leander Mehrgan, Eric Pantin, Miguel Riquelme, Joel Sanchez, Stefan Sandrock, Ralf Siebenmorgen, Jörg Stegmeier, Alain Smette, Julian Taylor, Mario van den Ancker, Guillermo Valdes, Lars Venema

Proceedings Volume 9908, 99080D (2016) https://doi.org/10.1117/12.2232441

KEYWORDS: Sensors, Mid-IR, Imaging spectroscopy, Detector arrays, Imaging systems, Image quality, Telescopes, Coronagraphy, Stars, Spectroscopy

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We present an overview of the VISIR instrument after its upgrade and return to science operations. VISIR is the midinfrared imager and spectrograph at ESO’s VLT. The project team is comprised of ESO staff and members of the original VISIR consortium: CEA Saclay and ASTRON. The project plan was based on input from the ESO user community with the goal of enhancing the scientific performance and efficiency of VISIR by a combination of measures: installation of improved hardware, optimization of instrument operations and software support. The cornerstone of the upgrade is the 1k by 1k Si:As AQUARIUS detector array manufactured by Raytheon. In addition, a new prism spectroscopic mode covers the whole N-band in a single observation. Finally, new scientific capabilities for high resolution and high-contrast imaging are offered by sub-aperture mask and coronagraphic modes. In order to make optimal use of favourable atmospheric conditions, a water vapour monitor has been deployed on Paranal, allowing for real-time decisions and the introduction of a user-defined constraint on water vapour. During the commissioning in 2012, it was found that the on-sky sensitivity of the AQUARIUS detector was significantly below expectations. Extensive testing of the detector arrays in the laboratory and on-sky enabled us to diagnose the cause for the shortcoming of the detector as excess low frequency noise. It is inherent to the design chosen for this detector and cannot be remedied by changing the detector set-up. Since this is a form of correlated noise, its impact can be limited by modulating the scene recorded by the detector. After careful analysis, we have implemented fast (up to 4 Hz) chopping with field stabilization using the secondary mirror of the VLT. During commissioning, the upgraded VISIR has been confirmed to be more sensitive than the old instrument, and in particular for low-resolution spectroscopy in the N-band, a gain of a factor 6 is realized in observing efficiency. After overcoming several additional technical problems, VISIR is back in Science Operations since April 2015. In addition an upgrade of the IT infrastructure related to VISIR has been conducted in order to support burst-mode operations. Science Verification of the new modes was performed in Feb 2016. The upgraded VISIR is a powerful instrument providing close to background limited performance for diffraction-limited observations at an 8-m telescope. It offers synergies with facilities such as ALMA, JWST, VLTI and SOFIA, while a wealth of targets is available from survey works like WISE. In addition, it will bring confirmation of the technical readiness and scientific value of several aspects for future mid-IR instrumentation at Extremely Large Telescopes. We also present several lessons learned during the project.

Proceedings Article | 26 July 2016 Paper

Paper

OIFITS version 2: the new standard for optical/IR interferometry data exchange

Gilles Duvert, John Young, Christian Hummel

Proceedings Volume 9907, 990710 (2016) https://doi.org/10.1117/12.2231492

KEYWORDS: Interferometry, Optical interferometry, Interferometers, Observatories, Calibration, Visibility, Polarization, Telescopes, Binary data, Infrared radiation

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Proceedings Article | 26 July 2016 Paper

Paper

Interferometric field of view measurements at the VLTI

Christian Hummel, Jean-Baptiste Le Bouquin, Antoine Merand

Proceedings Volume 9907, 99073B (2016) https://doi.org/10.1117/12.2230899

KEYWORDS: Interferometry, Data modeling, Speckle, Stars, Signal attenuation, Binary data, Electroluminescent displays, Space telescopes, Telescopes, Observatories

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Proceedings Article | 11 July 2016 Paper

Paper

Investigating the effect of atmospheric turbulence on mid-IR data quality with VISIR

Mario van den Ancker, Daniel Asmus, Christian Hummel, Hans-Ulrich Käufl, Florian Kerber, Alain Smette, Julian Taylor, Konrad Tristram, Jakob Vinther, Burkhard Wolff

Proceedings Volume 9910, 99102T (2016) https://doi.org/10.1117/12.2233701

KEYWORDS: Image quality, Mid-IR, Image quality, Planets, Stars, Transparency, Velocity measurements, Data modeling, Telescopes, Planetary systems, Statistical analysis

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Proceedings Article | 24 July 2014 Paper

Paper

The 2014 interferometric imaging beauty contest

John Monnier, Jean-Philippe Berger, Jean-Baptiste Le Bouquin, Peter Tuthill, Markus Wittkowski, Rebekka Grellmann, André Müller, Sridhar Renganswany, Christian Hummel, Karl-Heinz Hofmann, Dieter Schertl, Gerd Weigelt, John Young, David Buscher, Joel Sanchez-Bermudez, Antxon Alberdi, Rainer Schoedel, Rainer Köhler, Ferréol Soulez, Éric Thiébaut, Jacques Kluska, Fabien Malbet, Gilles Duvert, Stefan Kraus, Brian Kloppenborg, Fabien Baron, Willem-Jan de Wit, Thomas Rivinius, Antoine Merand

Proceedings Volume 9146, 91461Q (2014) https://doi.org/10.1117/12.2057312

KEYWORDS: Stars, Image restoration, Interferometry, Image processing, Visibility, Reconstruction algorithms, Telescopes, Data modeling, Spatial resolution, Optical interferometry

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Proceedings Article | 24 July 2014 Paper

Paper

VLTI status update: a decade of operations and beyond

Antoine Mérand, Roberto Abuter, Emmanuel Aller-Carpentier, Luigi Andolfato, Jaime Alonso, Jean-Philippe Berger, Guillaume Blanchard, Henri Boffin, Pierre Bourget, Paul Bristow, Claudia Cid, Willem-Jan de Wit, Diego del Valle, Françoise Delplancke-Ströbele, Frédéric Derie, Lorena Faundez, Steve Ertel, Rebekka Grellmann, Philippe Gitton, Andreas Glindemann, Patricia Guajardo, Sylvain Guieu, Stéphane Guisard, Serge Guniat, Pierre Haguenauer, Cristian Herrera, Christian Hummel, Carlos La Fuente, Marcelo Lopez, Pedro Mardones, Sébastien Morel, André Müller, Isabelle Percheron, Than Phan Duc, Andres Pino, Sébastien Poupar, Eszter Pozna, Andres Ramirez, Srihdaran Rengaswamy, Lionel Rivas, Thomas Rivinius, Alex Segovia, Christian Schmid, Markus Schöller, Nicolas Schuhler, Julien Woillez, Markus Wittkowski

Proceedings Volume 9146, 91460J (2014) https://doi.org/10.1117/12.2057150

KEYWORDS: Telescopes, Astatine, Interferometry, Observatories, Interferometers, Adaptive optics, Space telescopes, Stars, Large telescopes, Calibration

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Proceedings Article | 22 July 2010 Paper

Paper

A novel imaging algorithm for broadband aperture synthesis data

Christian Hummel

Proceedings Volume 7734, 77342H (2010) https://doi.org/10.1117/12.856363

KEYWORDS: Calibration, Black bodies, Visibility, Interferometry, Stars, Synthetic apertures, Algorithm development, Point spread functions, Composites, Spectroscopy

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Proceedings Article | 21 July 2010 Paper

Paper

Upgrade of VISIR the mid-infrared instrument at the VLT

F. Kerber, H. Kaeufl, M. van den Ancker, P. Baksai, D. Dubreuil, G. Durand, D. Dobrzycka, G. Finger, Ch. Hummel, D. Ives, G. Jakob, E. Lagadec, L. Lundin, G. Marconi, M. Moerchen, Y. Momany, D. Nuernberger, E. Pantin, M. Riquelme, R. Siebenmorgen, A. Smette, L. Venema, U. Weilenmann, I. Yegorova

Proceedings Volume 7735, 77357R (2010) https://doi.org/10.1117/12.857368

KEYWORDS: Sensors, Mid-IR, Telescopes, Astronomy, Observatories, Spectrographs, Infrared radiation, Coronagraphy, Spectral resolution, Infrared telescopes

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The European Southern Observatory (ESO) is preparing to upgrade VISIR, the mid-IR imager and spectrograph at the VLT. The project team is comprised of ESO staff and members of the original consortium that built VISIR: CEA Saclay and ASTRON. The goal is to enhance the scientific performance of VISIR and to facilitate its use by the ESO community. In order to capture the needs of the user community, we collected input from the users by means of a webbased questionnaire. In line with the results of the internal study and the input from the user community, the upgrade plan calls for a combination measures: installation of improved hardware, optimization of instrument operations and software support. The limitations of the current detector (sensitivity, cosmetics, artifacts) have been known for some time and a new 1k x 1k Si:As Aquarius array (Raytheon) will be the cornerstone of the VISIR upgrade project. A modified spectroscopic mode will allow covering the N-band in a single observation. Several new scientific modes (e.g., polarimetry, coronagraphy) will be implemented on a best effort basis. In addition, the VISIR operational scheme will be enhanced to ensure that optimal use of the observing conditions will be made. Specifically, we plan to provide a means to monitor precipitable water vapour (PWV) and enable the user to specify it as a constraint set for service mode observations. In some regions of the mid-IR domain, the amount of PWV has a fundamental effect on the quality of a given night for mid-IR astronomy. The plan also calls for full support by ESO pipelines that will deliver science-ready data products. Hence the resulting files will provide physical units and error information and all instrumental signatures will have been removed. An upgraded VISIR will be a powerful instrument providing diffraction-limited performance at an 8-m telescope. Its improved performance and efficiency as well as new science capabilities will serve the needs of the ESO community but will also offer synergy with various other facilities such as ALMA, JWST, VLTI and SOFIA. A wealth of targets for detailed study will be available from survey work done by VISTA and WISE. Finally, the upgraded VISIR will also serve as a pathfinder for potential mid-IR instrumentation at the European Extremely Large Telescope (E-ELT) in terms of technology as well as operations.

Proceedings Article | 28 July 2008 Paper

Paper

The Very Large Telescope Interferometer: an update

Pierre Haguenauer, Roberto Abuter, Jaime Alonso, Javier Argomedo, Bertrand Bauvir, Guillaume Blanchard, Henri Bonnet, Stéphane Brillant, Michael Cantzler, Frédéric Derie, Françoise Delplancke, Nicola Di Lieto, Christophe Dupuy, Yves Durand, Philippe Gitton, Bruno Gilli, Andreas Glindemann, Serge Guniat, Stéphane Guisard, Nicolas Haddad, Gerhard Hudepohl, Christian Hummel, Nathaniel Jesuran, Andreas Kaufer, Bertrand Koehler, Jean-Baptiste Le Bouquin, Samuel Lévêque, Christopher Lidman, Pedro Mardones, Serge Ménardi, Sébastien Morel, Isabelle Percheron, Monika Petr-Gotzens, Than Phan Duc, Florence Puech, Andres Ramirez, Fredrik Rantakyrö, Andrea Richichi, Thomas Rivinius, Johannes Sahlmann, Stefan Sandrock, Markus Schöller, Nicolas Schuhler, Fabio Somboli, Stanislav Stefl, Mario Tapia, Gerard Van Belle, Anders Wallander, Stefan Wehner, Markus Wittkowski

Proceedings Volume 7013, 70130C (2008) https://doi.org/10.1117/12.788209

KEYWORDS: Telescopes, Astatine, Adaptive optics, Mirrors, Interferometers, Large telescopes, Interferometry, IRIS Consortium, Sensors, Observatories

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Proceedings Article | 28 July 2008 Paper

Paper

A status report of the working group on calibrators of IAU Commission 54

Christian Hummel

Proceedings Volume 7013, 70134G (2008) https://doi.org/10.1117/12.789004

KEYWORDS: Calibration, Interferometry, Interferometers, Stars, Visibility, Infrared radiation, Atmospheric modeling, Phase measurement, Atmospheric sciences, Photometry

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Proceedings Article | 28 July 2008 Paper

Paper

2008 imaging beauty contest

William Cotton, John Monnier, Fabien Baron, Karl-Heinz Hofmann, Stefan Kraus, Gerd Weigelt, Sridharan Rengaswamy, Eric Thiébaut, Peter Lawson, Walter Jaffe, Christian Hummel, Tom Pauls, Henrique Schmitt, Peter Tuthill, John Young

Proceedings Volume 7013, 70131N (2008) https://doi.org/10.1117/12.788903

KEYWORDS: Data modeling, K band, Interferometry, Image restoration, Reconstruction algorithms, Visibility, Stars, Phase measurement, Image quality, Astronomical imaging

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Proceedings Article | 28 July 2008 Paper

Paper

Pipeline reductions of AMBER calibrator data

Christian Hummel

Proceedings Volume 7013, 70134D (2008) https://doi.org/10.1117/12.789060

KEYWORDS: Calibration, Visibility, Interferometers, Data archive systems, Interferometry, Wind measurement, Near infrared, Lawrencium, K band, Phase measurement

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Proceedings Article | 28 June 2006 Paper

Paper

Pipeline reductions of VLTI/MIDI data and quality control

Christian Hummel, Isabelle Percheron

Proceedings Volume 6268, 62683X (2006) https://doi.org/10.1117/12.671337

KEYWORDS: Calibration, Interferometry, Visibility, Data archive systems, Photometry, Observatories, Astronomy, Astatine, Data modeling, Reliability

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Proceedings Article | 28 June 2006 Paper

Paper

Thermal and deadtime effects in APD pulse detectors: a unified model

D. Peterson, D. Mozurkewich, C. Hummel

Proceedings Volume 6268, 62681O (2006) https://doi.org/10.1117/12.672094

KEYWORDS: Sensors, Avalanche photodetectors, Light emitting diodes, Thermal modeling, Diodes, Thermal effects, Quantum efficiency, Data modeling, Signal detection, Electrons

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Proceedings Article | 28 June 2006 Paper

Paper

Experiences from the first AMBER open time observations

Fredrik Rantakyrö, Pascal Ballester, Stephane Brillant, Gilles Duvert, Emmanuel Galliano, Christian Hummel, Andreas Kaufer, Mario Kiekebusch, Etienne Le-Coarer, Tom Licha, Fabien Malbet, Pedro Mardones, Florentin Millour, Sebastien Morel, Isabelle Percheron, Monika Petr-Gotzens, Romain Petrov, Andrea Richichi, Thomas Rivinius, Markus Schöller, Stan Stefl, Martin Vannier, Markus Wittkowski, Gerard Zins

Proceedings Volume 6268, 62681N (2006) https://doi.org/10.1117/12.671910

KEYWORDS: Telescopes, Calibration, K band, Observatories, Astatine, Motion models, Astronomy, Spectral resolution, Lawrencium, Interferometry

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Proceedings Article | 28 June 2006 Paper

Paper

2006 interferometry imaging beauty contest

Peter Lawson, William Cotton, Christian Hummel, Fabien Baron, John Young, Stefan Kraus, Karl-Heinz Hofmann, Gerd Weigelt, Michael Ireland, John Monnier, Eric Thiébaut, Sridharan Rengaswamy, Olivier Chesneau

Proceedings Volume 6268, 62681U (2006) https://doi.org/10.1117/12.670409

KEYWORDS: Interferometry, Data modeling, Interferometers, Visibility, Image restoration, Image resolution, Reconstruction algorithms, Observatories, Algorithm development, Telescopes

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Proceedings Article | 27 June 2006 Paper

Paper

Recent progress at the Very Large Telescope Interferometer

Markus Schöller, Javier Argomedo, Bertrand Bauvir, Leonardo Blanco-Lopez, Henri Bonnet, Stephane Brillant, Michael Cantzler, Johan Carstens, Fabio Caruso, Christian Choque-Cortez, Frederic Derie, Francoise Delplancke, Nicola Di Lieto, Martin Dimmler, Yves Durand, Mark Ferrari, Emmanuel Galliano, Philippe Gitton, Bruno Gilli, Andreas Glindemann, Serge Guniat, Stephane Guisard, Nicolas Haddad, Pierre Haguenauer, Nico Housen, Gerd Hudepohl, Christian Hummel, Andreas Kaufer, Mario Kiekebusch, Bertrand Koehler, Jean-Baptiste Le Bouquin, Samuel Leveque, Christopher Lidman, Pedro Mardones, Serge Menardi, Sebastien Morel, Manfred Mornhinweg, Jean-Luc Nicoud, Isabelle Percheron, Monika Petr-Gotzens, Than Phan Duc, Florence Puech, Andres Ramirez, Fredrik Rantakyrö, Andrea Richichi, Thomas Rivinius, Stefan Sandrock, Fabio Somboli, Jason Spyromilio, Stanislav Stefl, Vincent Suc, Roberto Tamai, Mario Tapia, Martin Vannier, Gautam Vasisht, Anders Wallander, Stefan Wehner, Markus Wittkowski, Juan Zagal

Proceedings Volume 6268, 62680L (2006) https://doi.org/10.1117/12.672231

KEYWORDS: Telescopes, Astatine, Interferometers, IRIS Consortium, Large telescopes, Interferometry, Mirrors, Optical fibers, Spectral resolution, Data archive systems

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Proceedings Article | 20 October 2004 Paper

Paper

VLTI science operations at Paranal

Fredrik Rantakyro, Emmanuel Galliano, Christian Hummel, Andreas Kaufer, Pierre Kervella, Sebastien Morel, Markus Schoeller, Martin Vannier, Markus Wittkowski

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550059

KEYWORDS: Telescopes, Calibration, Astatine, Observatories, Astronomical telescopes, Astronomy, Optical proximity correction, Stars, Interferometry, Particle swarm optimization

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Proceedings Article | 20 October 2004 Paper

Paper

Resolving the effects of rotation in early type stars

Deane Peterson, Christian Hummel, Thomas Pauls, J. Armstrong, James Benson, G. Gilbreath, Robert Hindsley, Donald Hutter, David Mozurkewich

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.552020

KEYWORDS: Stars, Atmospheric modeling, Solids, Data modeling, Phase measurement, Calibration, Observatories, Analytical research, Interferometers, Physics

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Proceedings Article | 20 October 2004 Paper

Paper

Preparing MIDI science operation at VLTI

Sebastien Morel, Pascal Ballester, Bertrand Bauvir, Peter Biereichel, Jean-Gabriel Cuby, Emmanuel Galliano, Nicholas Haddad, Nico Housen, Christian Hummel, Andreas Kaufer, Pierre Kervella, Isabelle Percheron, Florence Puech, Fredrik Rantakyro, Andrea Richichi, Cyrus Sabet, Markus Schoeller, Jason Spyromilio, Martin Vannier, Anders Wallander, Markus Wittkowski, Christoph Leinert, Uwe Graser, Udo Neumann, Walter Jaffe, Jeroen de Jong

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550116

KEYWORDS: Telescopes, Interferometry, Visibility, Observatories, Calibration, Interferometers, Sensors, Electronics, Photometry, Mirrors

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Proceedings Article | 20 October 2004 Paper

Paper

An interferometry imaging beauty contest

Peter Lawson, William Cotton, Christian Hummel, John Monnier, Ming Zhao, John Young, Hrobjartur Thorsteinsson, Serge Meimon, Laurent Mugnier, Guy Le Besnerais, Eric Thiebaut, Peter Tuthill

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550710

KEYWORDS: Data modeling, Interferometry, Interferometers, Visibility, Image restoration, Reconstruction algorithms, Telescopes, Synthetic apertures, Calibration, Radio optics

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Proceedings Article | 20 October 2004 Paper

Paper

Observing with the VLT interferometer

Markus Wittkowski, Pascal Ballester, Tim Canavan, Fernando Comeron, Christian Hummel, Andreas Kaufer, Stephane Marteau, Gautier Mathys, Sebastien Morel, Petra Nass, Isabelle Percheron, Michele Peron, Monika Petr-Gotzens, Fredrik Rantakyro, Andrea Richichi, Markus Schoeller, David Silva, Mario van den Ancker, Anders Wallander

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550389

KEYWORDS: Calibration, Stars, Visibility, Interferometry, Telescopes, Interferometers, Astatine, Data archive systems, Mid-IR, Prisms

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Proceedings Article | 20 October 2004 Paper

Paper

Selection of an optimum subset of telescope configurations for the VLT Interferometer

Emmanuel Galliano, Markus Schoeller, Michael Fischer, Christian Hummel, Sebastien Morel, Fredrik Rantakyro, Martin Vannier

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550348

KEYWORDS: Telescopes, Interferometers, Vignetting, Large telescopes, Observatories, Interferometry, Stellar interferometry, Visibility, Astatine

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Proceedings Article | 20 October 2004 Paper

Paper

Coherent integration of NPOI phase closure data on Altair

Christian Hummel, David Mozurkewich, James Benson, Deane Peterson

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550806

KEYWORDS: Data modeling, Calibration, Visibility, Stars, Interferometers, Data integration, Signal to noise ratio, Spectrometers, Observatories, Phase measurement

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Proceedings Article | 20 October 2004 Paper

Paper

Imaging stellar multiplicity with the NPOI

Donald Hutter, James Benson, Robert Zavala, Kenneth Johnston, Thomas Pauls, Christian Hummel, J. Armstrong

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.549955

KEYWORDS: Stars, Calibration, Observatories, Interferometry, Interferometers, Binary data, Visualization, Speckle interferometry, Systems modeling

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Proceedings Article | 20 October 2004 Paper

Paper

VLTI technical advances: present and future

Andreas Glindemann, Maja Albertsen, Luigi Andolfato, Gerardo Avila, Pascal Ballester, Bertrand Bauvir, Francoise Delplancke, Frederic Derie, Martin Dimmler, Philippe Duhoux, Emmanuel di Folco, R. Frahm, Emmanuel Galliano, Bruno Gilli, Paul Giordano, Philippe Gitton, Stephane Guisard, Nico Housen, Christian Hummel, Alexis Huxley, Robert Karban, Pierre Kervella, Mario Kiekebusch, Bertrand Koehler, Samuel Leveque, Tom Licha, Antonio Longinotti, Derek McKay, Serge Menardi, Guy Monnet, Sebastien Morel, Francesco Paresce, Isabelle Percheron, Monika Petr-Gotzens, Thanh Phan Duc, Joerg-Uwe Pott, Florence Puech, Fredrik Rantakyro, Andrea Richichi, Cyrus Sabet, Kevin Scales, Markus Schoeller, N. Schuhler, Mario van den Ancker, Martin Vannier, Anders Wallander, Markus Wittkowski, Rainer Wilhelm

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551468

KEYWORDS: Telescopes, Stars, Interferometry, Sensors, Adaptive optics, Astatine, Observatories, Near infrared, Mid-IR, IRIS Consortium

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Proceedings Article | 21 February 2003 Paper

Paper

Simultaneous 6-station observations with the NPOI

James Benson, Christian Hummel, David Mozurkewich

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459322

KEYWORDS: Spectrometers, Stars, Visibility, Calibration, Photon counting, Sensors, Detection and tracking algorithms, Avalanche photodetectors, Interferometers, Electronics

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Proceedings Article | 21 February 2003 Paper

Paper

Coherent integration using phase bootstrapping

Christian Hummel, David Mozurkewich, James Benson, Markus Wittkowski

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459143

KEYWORDS: Visibility, Signal to noise ratio, Algorithm development, Atmospheric modeling, Observatories, Data integration, Detection and tracking algorithms, Data modeling, Interferometers, Stars

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Proceedings Article | 21 February 2003 Paper

Paper

Interferometric measurements of stellar intensity profiles

Markus Wittkowski, Christian Hummel

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.457201

KEYWORDS: Visibility, Atmospheric modeling, Stars, Interferometry, Data modeling, Signal to noise ratio, Telescopes, Interferometers, Photodetectors, Calibration

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Proceedings Article | 2 January 2002 Paper

Paper

Operational experience with the Navy Prototype Optical Interferometer (NPOI)

Nathaniel White, David Mozurkewich, Donald Hutter, James Benson, Christian Hummel, James Clark

Proceedings Volume 4844, (2002) https://doi.org/10.1117/12.460763

KEYWORDS: Interferometers, Mirrors, Prototyping, Optical alignment, Stars, Telescopes, Electronics, Observatories, Control systems, Optical tracking

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Proceedings Article | 5 July 2000 Paper

Paper

Practice of interferometry with NPOI

Christian Hummel

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390240

KEYWORDS: Stars, Calibration, Interferometry, Imaging spectroscopy, Spectroscopy, Interferometers, Visibility, Observatories, Prototyping

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Proceedings Article | 24 July 1998 Paper

Paper

Images of spectroscopic binaries with the Navy Prototype Optical Interferometer

Christian Hummel

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317116

KEYWORDS: Visibility, Calibration, Stars, Data modeling, Binary data, Spectroscopy, Interferometers, Prototyping, Imaging spectroscopy, Algorithm development

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Proceedings Article | 24 July 1998 Paper

Paper

Observations of stellar limb darkening with the Navy Prototype Optical Interferometer

Thomas Pauls, David Mozurkewich, J. Thomas Armstrong, Christian Hummel, James Benson, Arsen Hajian

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317112

KEYWORDS: Stars, Interferometers, Spatial frequencies, Data modeling, Visibility, Atmospheric modeling, Prototyping, Ocean optics, Phase measurement, Observatories

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Proceedings Article | 24 July 1998 Paper

Paper

First astrometric results from the NPOI

Donald Hutter, Nicholas Elias, Christian Hummel

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317110

KEYWORDS: Stars, Metrology, Interferometers, Imaging arrays, Observatories, Prototyping, Geometrical optics, Atmospheric optics, Modulation, Dispersion

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Showing 5 of 40 publications

Conference Committee Involvement (1)

New Frontiers in Stellar Interferometry

21 June 2004 | Glasgow, United Kingdom

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