HAL: hal-00391861, version 1

arXiv: 0812.1267

ADS Bibliographic id: 2008Sci...322..558M

DOI: 10.1126/SCIENCE.1163004

Detailed view

Export this paper BibTeX - EndNote - TEI - RefWorks -

Science 322 (2008) 558-

CoRoT Measures Solar-Like Oscillations and Granulation in Stars Hotter Than the Sun

Eric Michel 1, Annie Baglin 1, Michel Auvergne 1, Claude Catala 1, Reza Samadi 1, Frédéric Baudin, Thierry Appourchaux, Caroline Barban, Werner W. Weiss, Gabrielle Berthomieu, Patrick Boumier, Marc-Antoine Dupret, Rafael A. Garcia, Malcolm Fridlund, Rafael Garrido, Marie-Jo Goupil, Hans Kjeldsen, Yveline Lebreton, Benoît Mosser, Arlette Grotsch-Noels, Eduardo Janot-Pacheco, Janine Provost, Ian W. Roxburgh, Anne Thoul, Thierry Toutain, Didier Tiphène, Sylvaine Turck-Chieze, Sylvie D. Vauclair 2, Gérard P. Vauclair 2, Conny Aerts, Georges Alecian, Jérôme Ballot, Stéphane Charpinet 2, Anne-Marie Hubert, François Lignières 2, Philippe Mathias, Mario J. P. F. G. Monteiro, Coralie Neiner, Ennio Poretti, José Renan de Medeiros, Ignasi Ribas, Michel L. Rieutord 2, Teodoro Roca Cortés, Konstanze Zwintz

(2008-10)

Oscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties despite the strong efforts of the international community over the past decades. The CoRoT (Convection Rotation and Planetary Transits) satellite, launched in December 2006, has now measured oscillations and the stellar granulation signature in three main sequence stars that are noticeably hotter than the sun. The oscillation amplitudes are about 1.5 times as large as those in the Sun; the stellar granulation is up to three times as high. The stellar amplitudes are about 25% below the theoretic values, providing a measurement of the nonadiabaticity of the process ruling the oscillations in the outer layers of the stars.

1:	Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA)
	CNRS : UMR8109 – INSU – Observatoire de Paris – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot
2:	Laboratoire Astrophysique de Toulouse-Tarbes (LATT)
	CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III

Subject

:

Sciences of the Universe/Astrophysics/Galactic Astrophysics

hal-00391861, version 1

http://hal.archives-ouvertes.fr/hal-00391861

oai:hal.archives-ouvertes.fr:hal-00391861

From: Dominique Lullier <>

Submitted on: Friday, 5 June 2009 10:06:02

Updated on: Friday, 5 June 2009 10:06:02