Title :

The excitation of solar-like oscillations in a $\delta$ Sct star by efficient envelope convection

Author(s) :

Antoci, V. [Auteur correspondant]
Institute for Astronomy [Vienna]
Handler, G. [Auteur]
Copernicus Astronomical Center of the Polish Academy of Sciences [CAMK]
Institute for Astronomy [Vienna]
L. Campante, T. [Auteur]
Department of Physics and Astronomy [Aarhus]
Centro de Astrofísica da Universidade do Porto [CAUP]
O. Thygesen, A. [Auteur]
Department of Physics and Astronomy [Aarhus]
Moya, A. [Auteur]
Centro de Astrobiologia [Madrid] [CAB]
Kallinger, T. [Auteur]
Institute for Astronomy [Vienna]
Stello, D. [Auteur]
Sydney Institute for Astronomy [SIfA]
Grigahcène, A. [Auteur]
Centro de Astrofísica da Universidade do Porto [CAUP]
Kjeldsen, H. [Auteur]
Department of Physics and Astronomy [Aarhus]
R. Bedding, T. [Auteur]
Sydney Institute for Astronomy [SIfA]
Lüftinger, T. [Auteur]
Institute for Astronomy [Vienna]
Christensen-Dalsgaard, J. [Auteur]
Department of Physics and Astronomy [Aarhus]
Catanzaro, G. [Auteur]
INAF - Osservatorio Astrofisico di Catania [OACT]
Frasca, A. [Auteur]
INAF - Osservatorio Astrofisico di Catania [OACT]
de Cat, P. [Auteur]
Solar Influences Data Analysis Center [Brussels] [SIDC]
Uytterhoeven, K. [Auteur]
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
Bruntt, H. [Auteur]
Department of Physics and Astronomy [Aarhus]
Houdek, G. [Auteur]
Institute for Astronomy [Vienna]
W. Kurtz, D. [Auteur]
Jeremiah Horrocks Institute for Mathematics, Physics and Astronomy [Preston]
Lenz, P. [Auteur]
Copernicus Astronomical Center of the Polish Academy of Sciences [CAMK]
Kaiser, Andreas [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
van Cleve, J. [Auteur]
Search for Extraterrestrial Intelligence Institute [SETI Institute]
Allen, C. [Auteur]
NASA Ames Research Center [ARC]
Clarke, B.D. [Auteur]
Search for Extraterrestrial Intelligence Institute [SETI Institute]

Journal title :

Nature

Pages :

570-573

Publisher :

Nature Publishing Group

Publication date :

2011

ISSN :

0028-0836

HAL domain(s) :

Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
Physique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]

English abstract : [en]

Delta Scuti ($\delta$ Sct) stars are opacity-driven pulsators with masses of 1.5-2.5$M \odot$, their pulsations resulting from the varying ionization of helium. In less massive stars such as the Sun, convection transports ...
Show more >Delta Scuti ($\delta$ Sct) stars are opacity-driven pulsators with masses of 1.5-2.5$M \odot$, their pulsations resulting from the varying ionization of helium. In less massive stars such as the Sun, convection transports mass and energy through the outer 30 per cent of the star and excites a rich spectrum of resonant acoustic modes. Based on the solar example, with no firm theoretical basis, models predict that the convective envelope in $\delta$ Sct stars extends only about 1 per cent of the radius, but with sufficient energy to excite solar-like oscillations. This was not observed before the Kepler mission, so the presence of a convective envelope in the models has been questioned. Here we report the detection of solar-like oscillations in the $\delta$ Sct star HD 187547, implying that surface convection operates efficiently in stars about twice as massive as the Sun, as the $ad\ hoc$ models predictedShow less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL