Seismic signatures of stellar cores of solar-like pulsators: Dependence on mass and age

• Type: Article in International Scientific Journal
• Date: 2010

Authors

I.M. Brandao (Author) FCUP; M.S. Cunha (Author) FCUP; O.L. Creevey (Author) FCUP; J. Christensen-Dalsgaard (Author) FCUP

Journal

Title: Astronomische Nachrichten

Vol. 331 No. 9-10

Pages: 940-943

ISSN: 0004-6337

Publisher: Wiley-Blackwell

Indexing

ISI Web of Science

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Abstract (EN): Useful information from the inner layers of stellar pulsators may be derived from the study of their oscillations. In this paper we analyse three diagnostic tools suggested in the literature built from the oscillation frequencies computed for a set of main sequence models with masses between 1.0M(circle dot) and 1.6M(circle dot), to check what information they may hold about stellar cores. For the models with convective cores (M = 1.2M(circle dot)) we find a relation between the frequency slopes of the diagnostic tools and the size of the jump in the sound speed at the edge of the core. We show that this relation is independent of the mass of the models. In practice, since the size of the jump in the sound speed is related to the age of the star, using these seismic tools we may, in principle, infer the star's evolutionary state. We also show that when combining two of the three diagnostic tools studied, we are able to distinguish models with convective cores from models without a convective core but with strong sound speed gradients in the inner layers

Language: English

Type (Professor's evaluation): Scientific