Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.328...67o&link_type=abstract
Astrophysics and Space Science, Volume 328, Issue 1-2, pp. 67-71
Astronomy and Astrophysics
Astrophysics
Solar-Like Stars: Fundamental Parameters
Scientific paper
In the previous years, p-mode oscillations (pressure oscillations stochastically excited by convection) have been detected in several solar-like stars thanks to the ground-based spectroscopic and space spectroscopic and photometric observations. We study the importance of seismic constraints on stellar modeling and the impact of their accuracy on reducing the uncertainties of global stellar parameters (i.e. mass, age, etc.). We use the Singular Value Decomposition (SVD) method to analyze the sensitivity of stellar models to seismic constraints. In this context, we construct a grid of evolutionary sequences for solar-like stars with varying age and mass. Around each model of this grid, we evaluate the partial derivatives with respect to a large set of free parameters: mass ℳ, age τ, mixing-length parameter α, initial helium abundance Y 0, and initial metallicity Z/ X 0. Masses between 0.9 and 1.55 M &sun; and central hydrogen abundances from Xc=0.7 to 0.05 have been considered in this study.
Baglin Annie
Dupret Marc-Antoine
Ozel N.
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