Query : 2012A&A...540L...7B

2012A&A...540L...7B - Astronomy and Astrophysics, volume 540, L7-7 (2012/4-1)

Damping rates of solar-like oscillations across the HR diagram. Theoretical calculations confronted to CoRoT and Kepler observations.


Abstract (from CDS):

The space-borne missions CoRoT and Kepler are providing a rich harvest of high-quality constraints on solar-like pulsators. Among the seismic parameters, mode damping rates remains poorly understood and are thus barely used to infer the physical properties of stars. Nevertheless, thanks to the CoRoT and Kepler spacecrafts it is now possible to measure damping rates for hundreds of main-sequence and thousands of red-giant stars with unprecedented precision. By using a non-adiabatic pulsation code including a time-dependent convection treatment, we compute damping rates for stellar models that are representative of solar-like pulsators from the main-sequence to the red-giant phase. This allows us to reproduce the observations of both CoRoT and Kepler, which validates our modeling of mode damping rates and thus the underlying physical mechanisms included in the modeling. By considering the perturbations of turbulent pressure and entropy (including the perturbation of the dissipation rate of turbulent energy into heat) by the oscillation in our computation, we succeed in reproducing the observed relation between damping rates and effective temperature. Moreover, we discuss the physical reasons for mode damping rates to scale with effective temperature, as observationally exhibited. Finally, this opens the way for the use of mode damping rates to probe turbulent convection in solar-like stars.

Abstract Copyright:

Journal keyword(s): asteroseismology - convection - stars: oscillations - stars: solar-type

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 HD 49385A PM* 06 48 11.5030769640 +00 18 17.894873196   7.952 7.399 8.28   G0V 86 1
2 HD 49933 PM* 06 50 49.8309774552 -00 32 27.167495244   6.147 5.771 7.04   F3V 372 2
3 HD 50890 RG* 06 54 58.9171473552 -02 48 12.922874748   7.112 6.017     K2III 39 0
4 HD 181420 PM* 19 20 27.0720449304 -01 18 35.132869692   6.98 6.55     F6V 87 0
5 HD 181907 RG* 19 22 21.5480809056 -00 15 08.508393504   6.906 5.811     K1III 61 0

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