Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-14
Astrophys.J.636:1078-1086,2006
Astronomy and Astrophysics
Astrophysics
13 pages, 7 figures, ApJ in press
Scientific paper
10.1086/498057
The space telescope MOST is now providing us with extremely accurate low frequency p-mode oscillation data for the star Eta Boo. We demonstrate in this paper that these data, when combined with ground based measurements of the high frequency p-mode spectrum, can be reproduced with stellar models that include the effects of turbulence in their outer layers. Without turbulence, the l=0 modes of our models deviate from either the ground based or the space data by about 1.5-4.0 micro Hz. This discrepancy can be completely removed by including turbulence in the models and we can exactly match 12 out of 13 MOST frequencies that we identified as l=0 modes in addition to 13 out of 21 ground based frequencies within their observational 2 sigma tolerances. The better agreement between model frequencies and observed ones depends for the most part on the turbulent kinetic energy which was taken from a 3D convection simulation for the Sun.
Demarque Pierre
Guenther David B.
Li Linghuai
Robinson Frank J.
Straka Christian W.
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