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

Abstract

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 both 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 μHz). Conclusions. Widths measured in main-sequence stars show a different variation with the effective temperature than red giants. A single scaling law is derived for mode amplitudes of both 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.

Accepted in A&A on 2011 February 8th, now includes corrections (results now more precise on Γand A_max in Section 4.3 and 4.4, fig. 7 corrected consequently)

References in corpus (10)

• Asteroseismology of red giants from the first four months of Kepler data: Fundamental parameters
• Asteroseismology of red giants from the first four months of Kepler data: Global oscillation parameters for 800 stars
• Excitation of solar-like oscillations across the HR diagram
• Intrinsic photometric characterisation of stellar oscillations and granulation. Solar reference values and CoRoT response functions
• The Structure of Molecular Clouds: I - All Sky Near Infrared Extinction Maps
• Challenges for asteroseismic analysis of Sun-like stars
• Wide-field mid-infrared and millimetre imaging of the high-redshift radio galaxy, 4C41.17
• A closure model with plumes II. Application to the stochastic excitation of stellar p modes
• The Discovery of Stellar Oscillations in the K Giant $\iota$ Dra
• The CoRoT primary target HD 52265: models and seismic tests

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