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Title:
Asteroseismic diagnostics of stellar convective cores
Authors:
Mazumdar, Anwesh; Basu, Sarbani; Collier, Braxton L.; Demarque, Pierre
Affiliation:
AA(Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA; ), AB(Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA; ), AC(Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA; ), AD(Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA; )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 372, Issue 2, pp. 949-958. (MNRAS Homepage)
Publication Date:
10/2006
Origin:
MNRAS
MNRAS Keywords:
convection , stars: evolution , stars: interiors , stars: oscillations
DOI:
10.1111/j.1365-2966.2006.10912.x
Bibliographic Code:
2006MNRAS.372..949M

Abstract

We present a detailed study of the small frequency separations as diagnostics of the mass of the convective core and evolutionary stage of solar-type stars. We demonstrate how the small separations can be combined to provide sensitive tests for the presence of convective overshoot at the edge of the core. These studies are focused on low-degree oscillation modes, the only modes expected to be detected in distant stars. Using simulated data with realistic errors, we find that the mass of the convective core can be estimated to within 5 per cent if the total stellar mass is known. Systematic errors arising due to uncertainty in the mass could be up to 20 per cent. The evolutionary stage of the star, determined in terms of the central hydrogen abundance using our proposed technique, however, is much less sensitive to the mass estimate.

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