Dr. Keiichi Ohnaka Profile

Dr. Keiichi Ohnaka

at Andrés Bello

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 13 December 2020 Poster + Paper

Development of an experimental optical adaptive optics for small telescopes

Takeo Minezaki, Yukihiro Kono, Leonardo Vanzi, Abner Zapata, Mauricio Flores, Sebastian Ramirez, Keiichi Ohnaka

Proceedings Volume 11448, 114486Z (2020) https://doi.org/10.1117/12.2562015

KEYWORDS: Adaptive optics, Telescopes, Astronomy, Point spread functions, Spatial resolution, Optical instrument design, Instrumentation engineering, Observatories, Lanthanum, Wavefronts

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Proceedings Article | 28 July 2008 Paper

Mid-infrared view of cool evolved stars with the Very Large Telescope Interferometer

Keiichi Ohnaka, Thomas Driebe, Karl-Heinz Hofmann, Gerd Weigelt, Markus Wittkowski

Proceedings Volume 7013, 70134M (2008) https://doi.org/10.1117/12.788775

KEYWORDS: Stars, Silicates, Carbon, Mid-IR, Visibility, Large telescopes, Interferometers, Solids, Interferometry, Diamond

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Proceedings Article | 28 July 2008 Paper

Infrared spectro-interferometry of YSOs

Stefan Kraus, Karl-Heinz Hofmann, Keiichi Ohnaka, Thomas Preibisch, Gerd Weigelt

Proceedings Volume 7013, 70130R (2008) https://doi.org/10.1117/12.789219

KEYWORDS: Stars, Visibility, Interferometry, Infrared radiation, Calibration, Near infrared, Infrared spectroscopy, Beryllium, Bromine, Binary data

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Proceedings Article | 28 June 2006 Paper

VLTI/MIDI observation of the silicate carbon star Hen 38 (IRAS08002-3803): silicate dust reservoir spatially resolved for the first time

Keiichi Ohnaka, Thomas Driebe, Karl-Heinz Hofmann, Thomas Preibisch, Dieter Schertl, Gerd Weigelt

Proceedings Volume 6268, 62682V (2006) https://doi.org/10.1117/12.671145

KEYWORDS: Silicates, Stars, Carbon, Visibility, Surface conduction electron emitter displays, Iron, Radiative transfer, Spherical lenses, Lawrencium, Solids

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Proceedings Article | 28 June 2006 Paper

VLTI-AMBER observations of Eta Carinae with high spatial resolution and spectral resolutions of 1,500 and 10,000

Gerd Weigelt, Romain Petrov, Olivier Chesneau, Kris Davidson, Armando Domiciano de Souza, Thomas Driebe, Renaud Foy, Didier Fraix-Burnet, Ted Gull, John Hillier, Karl-Heinz Hofmann, Stefan Kraus, Fabien Malbet, Alessandro Marconi, Philippe Mathias, Jean-Louis Monin, Florentin Millour, Keiichi Ohnaka, Frederik Rantakyrö, Andrea Richichi, Dieter Schertl, Markus Schöller, Philippe Stee, Leonardo Testi, Markus Wittkowski

Proceedings Volume 6268, 62682S (2006) https://doi.org/10.1117/12.671582

KEYWORDS: Visibility, Bromine, Spectral resolution, K band, Stars, Spatial resolution, Phase measurement, Observatories, Interferometry, Near infrared

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Proceedings Article | 20 October 2004 Paper

Interferometric observations of the Mira star o Ceti with the VLTI/VINCI instrument in the near-infrared

Henry Woodruff, Maren Eberhardt, Thomas Driebe, Karl-Heinz Hofmann, Keiichi Ohnaka, Andrea Richichi, Dieter Schertl, Markus Schoeller, Michael Scholz, Gerd Weigelt, Markus Wittkowski, Peter Wood

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551245

KEYWORDS: Visibility, Stars, Calibration, Interferometry, Atmospheric modeling, K band, Data modeling, Spatial frequencies, Surface conduction electron emitter displays, Speckle

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Proceedings Article | 30 September 2004 Paper

AMBER instrument control software

Etienne leCoarer, Gerard Zins, Laurence Gluck, Gilles Duvert, Thomas Driebe, Keiichi Ohnaka, Matthias Heininger, Claus Connot, Jan Behrend, Michel Dugue, Jean Michel Clausse, Florentin Millour

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.551301

KEYWORDS: Sensors, Interferometry, Telescopes, Visibility, Nondestructive evaluation, Calibration, Electronics, Spectral resolution, Data processing, Astronomy

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Proceedings Article | 21 February 2003 Paper

IOTA observation of the circumstellar envelope of R CrB

Keiichi Ohnaka, Udo Beckmann, Jean-Philippe Berger, Michael Brewer, Karl-Heinz Hofmann, Marc Lacasse, Victor Malanushenko, Rafael Millan-Gabet, John Monnier, Ettore Pedretti, Dieter Schertl, F. Peter Schloerb, Victor Shenavrin, Wesley Traub, Gerd Weigelt, Boris Yudin

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458931

KEYWORDS: Visibility, Stars, K band, Interferometry, Surface conduction electron emitter displays, Clouds, Infrared telescopes, Astronomy, Infrared radiation, Optical telescopes

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Proceedings Article | 21 February 2003 Paper

Near-infrared IOTA interferometry of the symbiotic star CH Cyg

Karl-Heinz Hofmann, Udo Beckmann, Jean-Philippe Berger, Thomas Bloecker, Michael Brewer, Marc Lacasse, Victor Malanushenko, Rafael Millan-Gabet, John Monnier, Keiichi Ohnaka, Ettore Pedretti, Dieter Schertl, F. Peter Schloerb, Michael Scholz, Wesley Traub, Gerd Weigelt, Boris Yudin

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458904

KEYWORDS: Visibility, Stars, K band, Interferometry, Electromagnetic coupling, Linear filtering, Astronomy, Interferometers, Radium, Physics

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Proceedings Article | 21 February 2003 Paper

New beam-combination techniques at IOTA

Wesley Traub, Angela Ahearn, Nathaniel Carleton, Jean-Philippe Berger, Michael Brewer, Karl-Heinz Hofmann, Pierre Kern, Marc Lacasse, Fabien Malbet, Rafael Millan-Gabet, John Monnier, Keiichi Ohnaka, Ettore Pedretti, Sam Ragland, F. Peter Schloerb, Kamal Souccar, Gerd Weigelt

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459718

KEYWORDS: Telescopes, Stars, Sensors, Interferometers, Integrated optics, Mirrors, Charge-coupled devices, Visibility, Computing systems, Control systems

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Proceedings Article | 21 February 2003 Paper

JHK-band spectro-interferometry of T Cep with the IOTA interferometer

Gerd Weigelt, Udo Beckmann, Jean-Philippe Berger, Thomas Bloecker, Michael Brewer, Karl-Heinz Hofmann, Marc Lacasse, Victor Malanushenko, Rafael Millan-Gabet, John Monnier, Keiichi Ohnaka, Ettore Pedretti, Dieter Schertl, F. Peter Schloerb, Michael Scholz, Wesley Traub, Boris Yudin

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458659

KEYWORDS: Visibility, K band, Stars, Interferometers, Radium, Linear filtering, Astronomy, Prisms, Temperature metrology, Spatial frequencies

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Showing 5 of 11 publications

Conference Committee Involvement (8)

Optical and Infrared Interferometry and Imaging IX

17 June 2024 | Yokohama, Japan

Optical and Infrared Interferometry and Imaging VIII

17 July 2022 | Montréal, Québec, Canada

Optical and Infrared Interferometry and Imaging VII

14 December 2020 | Online Only, California, United States

Optical and Infrared Interferometry and Imaging VII

14 December 2020 | Online Only, California, United States

Optical and Infrared Interferometry and Imaging VII

13 December 2020 | San Diego, California, United States

Showing 5 of 8 Conference Committees

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