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4 results on '"F. Dauny"'

1. Search for p-mode oscillations in RX J2117.1+3412

Author

A. Fernandez, F. Roques, Chih-Yuan Liu, Hsiang-Kuang Chang, F. Dauny, T. Fan, A. Doressoundiram, I. C. Shih, B. Christophe, Y. S. Wu, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Observatoire de Saint-Sulpice N°947

Subjects
Physics, [PHYS]Physics [physics], 010308 nuclear & particles physics, Oscillation, Mode (statistics), White dwarf, Astronomy, Astronomy and Astrophysics, Astrophysics, Photometer, 01 natural sciences, law.invention, Telescope, Stars, Space and Planetary Science, law, 0103 physical sciences, Cadence, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Relative amplitude, ComputingMilieux_MISCELLANEOUS
Abstract

We report the effort to search for white dwarf p-mode oscillations in RX J2117.1+3412 (V2027 Cyg), a GW Vir star. The data were taken with Miosotys, a multi-fiber photometer, mounted on the 1.93-m telescope at Observatoire de Haute-Provence (OHP) with a 20-Hz cadence in May 2010 and June 2012. Two intriguing signatures at 1.2081 Hz and 2.5852 Hz were found at 3.8-σ and 3.5-σ significance levels, respectively. However, possible atmospheric effects cannot be ruled out. If these two features are not real, the 3-σ upper limit of the relative amplitude for the possible oscillations in the frequency range from 1 to 10 Hz is estimated to be about 6 × 10 −4 . This is the first report in the literature for a p-mode oscillation search of GW Vir stars.

Published
2013
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2. Interferometric Coupling of the Keck Telescopes with Single-Mode Fibers

Author

Stephen T. Ridgway, F. Dauny, Olivier Guyon, Jean Guerin, J. Gathright, Peter Wizinowich, C. Collin, J. Nishikawa, Francois Rigaut, Katherine C. Roth, M. Hrynevych, D. Ziegler, Guy Perrin, P. Fédou, J. Crétenet, Sébastien Vergnole, Andrew J. Adamson, Laurent Delage, C. Berthod, C. Deléglise, M. Marteaud, B.-T. Melse, Julien Woillez, C. Marlot, Pierre Léna, T. Goeltzenlichter, Takayuki Kotani, D. Le Mignant, Alan T. Tokunaga, B. Brient, R. Hulin, Frederic H. Chaffee, Jean-Michel Reess, Olivier Lai, François Reynaud, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Astronomie du LESIA, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Ingénieurs, Techniciens et Administratifs, W. M. Keck Observatory, Canada-France-Hawaii Telescope Corporation (CFHT), National Research Council of Canada (NRC)-Centre National de la Recherche Scientifique (CNRS)-University of Hawai'i [Honolulu] (UH), Institut de Recherche en Communications Optiques et Microondes (IRCOM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), United Kingdom Infra-Red Telescope, Hilo, Division technique INSU/SDU (DTI), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Pôle instrumental, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Subaru Telescope, National Astronomical Observatory of Japan (NAOJ), National Optical Astronomy Observatory, Tucson (NOAO), Gemini Observatory, and Institute for Astronomy, University of Hawaii

Subjects
Coupling, Physics, Multidisciplinary, Wavelength range, business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, Single-mode optical fiber, Astrophysics::Cosmology and Extragalactic Astrophysics, Interferometry, Optics, Interference (communication), Mauna kea, Observatory, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], business, Astrophysics::Galaxy Astrophysics
Abstract

Here we report successful interferometric coupling of two large telescopes with single-mode fibers. Interference fringes were obtained in the 2- to 2.3-micrometer wavelength range on the star 107 Herculis by using the two Keck 10-meter telescopes, each feeding their common interferometric focus with 300 meters of single-mode fibers. This experiment demonstrates the potential of fibers for future kilometric arrays of telescopes and is the first step toward the 'OHANA (Optical Hawaiian Array for Nanoradian Astronomy) interferometer at the Mauna Kea observatory in Hawaii. It opens the way to sensitive optical imagers with resolutions below 1 milli‐arc second. Our experimental setup can be directly extended to large telescopes separated by many hundreds of meters.

Published
2006
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4. Interferometric coupling of the Keck telescopes with single-mode fibers.

Author

Perrin G, Woillez J, Lai O, Guérin J, Kotani T, Wizinowich PL, Le Mignant D, Hrynevych M, Gathright J, Léna P, Chaffee F, Vergnole S, Delage L, Reynaud F, Adamson AJ, Berthod C, Brient B, Collin C, Crétenet J, Dauny F, Deléglise C, Fédou P, Goeltzenlichter T, Guyon O, Hulin R, Marlot C, Marteaud M, Melse BT, Nishikawa J, Reess JM, Ridgway ST, Rigaut F, Roth K, Tokunaga AT, and Ziegler D

Abstract

Here we report successful interferometric coupling of two large telescopes with single-mode fibers. Interference fringes were obtained in the 2- to 2.3-micrometer wavelength range on the star 107 Herculis by using the two Keck 10-meter telescopes, each feeding their common interferometric focus with 300 meters of single-mode fibers. This experiment demonstrates the potential of fibers for future kilometric arrays of telescopes and is the first step toward the 'OHANA (Optical Hawaiian Array for Nanoradian Astronomy) interferometer at the Mauna Kea observatory in Hawaii. It opens the way to sensitive optical imagers with resolutions below 1 milli-arc second. Our experimental setup can be directly extended to large telescopes separated by many hundreds of meters.

Published
2006
Full Text
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