2011A&A...530A.142B


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.21CET18:51:10

2011A&A...530A.142B - Astronomy and Astrophysics, volume 530A, 142-142 (2011/6-1)

The underlying physical meaning of the νmaxc relation.

BELKACEM K., GOUPIL M.J., DUPRET M.A., SAMADI R., BAUDIN F., NOELS A. and MOSSER B.

Abstract (from CDS):

Asteroseismology of stars that exhibit solar-like oscillations are enjoying a growing interest with the wealth of observational results obtained with the CoRoT and Kepler missions. In this framework, scaling laws between asteroseismic quantities and stellar parameters are becoming essential tools to study a rich variety of stars. However, the physical underlying mechanisms of those scaling laws are still poorly known. Our objective is to provide a theoretical basis for the scaling between the frequency of the maximum in the power spectrum (νmax) of solar-like oscillations and the cut-off frequency (νc). Using the SoHO GOLF observations together with theoretical considerations, we first confirm that the maximum of the height in oscillation power spectrum is determined by the so-called [plateau of the damping rates. The physical origin of the plateau can be traced to the destabilizing effect of the Lagrangian perturbation of entropy in the upper-most layers, which becomes important when the modal period and the local thermal relaxation time-scale are comparable. Based on this analysis, we then find a linear relation between νmax and νc, with a coefficient that depends on the ratio of the Mach number of the exciting turbulence to the third power to the mixing-length parameter.

Abstract Copyright:

Journal keyword(s): convection - turbulence - stars: oscillations - stars: interiors

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 49385A PM* 06 48 11.5030662194 +00 18 17.893672741   7.952 7.399 8.28   G0V 69 1
2 HD 49933 ** 06 50 49.831 -00 32 27.18           F3V 321 1
3 HD 50890 RG* 06 54 58.9169109104 -02 48 12.925826456   7.112 6.017     K2III 33 0
4 HD 52265 PM* 07 00 18.0357152121 -05 22 01.778490073   6.845 6.282     G0V 277 1
5 HD 180420 * 19 17 55.7433796940 -34 31 10.179774252   8.66 8.29     A7III 10 0
6 HD 181420 PM* 19 20 27.0723438937 -01 18 35.134035438   6.98 6.55     F6V 76 0
7 HD 181907 RG* 19 22 21.5484905118 -00 15 08.489087052   6.906 5.811     K1III 48 0

    Equat.    Gal    SGal    Ecl

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2019.11.21-18:51:10

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