Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars - Université Paris Cité Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2011

Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars

Résumé

Context. The advent of space-borne missions such as CoRoT or Kepler providing photometric data has brought new possibilities for asteroseismology across the H-R diagram. Solar-like oscillations are now observed in many stars, including red giants and main-sequence stars.
Aims: Based on several hundred identified pulsating red giants, we aim to characterize their oscillation amplitudes and widths. These observables are compared with those of main-sequence stars in order to test trends and scaling laws for these parameters for main-sequence stars and red giants.
Methods: An automated fitting procedure is used to analyze several hundred Fourier spectra. For each star, a modeled spectrum is fitted to the observed oscillation spectrum, and mode parameters are derived.
Results: Amplitudes and widths of red-giant solar-like oscillations are estimated for several hundred modes of oscillation. Amplitudes are relatively high (several hundred ppm) and widths relatively small (very few tenths of a muHz).
Conclusions: Widths measured in main-sequence stars show a different variation with the effective temperature from red giants. A single scaling law is derived for mode amplitudes of red giants and main-sequence stars versus their luminosity to mass ratio. However, our results suggest that two regimes may also be compatible with the observations.
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hal-03742795 , version 1 (05-09-2022)

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Frederic Baudin, Caroline Barban, Kevin Belkacem, Saskia Hekker, Thierry Morel, et al.. Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars. Astronomy and Astrophysics - A&A, 2011, 529, pp.84. ⟨10.1051/0004-6361/201014037⟩. ⟨hal-03742795⟩
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