How asteroseismology can constrain the global parameters of solar-like star models


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ÖZEL N. , Dupret M. -. , Baglin A.

ASTROPHYSICS AND SPACE SCIENCE, cilt.328, ss.67-71, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 328
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1007/s10509-010-0311-4
  • Dergi Adı: ASTROPHYSICS AND SPACE SCIENCE
  • Sayfa Sayısı: ss.67-71

Özet

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 tau, mixing-length parameter a, initial helium abundance Y(0), and initial metallicity Z/X(0). Masses between 0.9 and 1.55 M(circle dot) and central hydrogen abundances from Xc = 0.7 to 0.05 have been considered in this study.