Physics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pobeo..90..171p&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 90, pp. 171-174
Physics
Scientific paper
In order to extract the basic stellar parameters we use the asteroseismic inversion method where the observed oscillation frequencies are used to estimate the stellar parameters. The inversion is a process where the best estimated parameters for a given star correspond to the input parameters for the model that shows frequencies most similar to the observed ones. We have computed a wide grid of stellar models and their associated oscillation frequencies and we have designed a tool to evaluate the value of χ^{2} on that grid for different possible sets of observational data. Stellar models have been calculated with the CESAM stellar evolution code for values of mass in the range 0.8 - 4.0 solar masses, initial metalicity Z in mass fraction in the range 0.006 - 0.04 and initial helium abundance in the range 0.26 - 0.28, and we considered different values or options for the input physics of the models (microscopic diffusion, mixing - length parameter of convection, overshooting). The oscillation frequencies have been computed with the LNAWENR non-adiabatic code for modes of degree l=0, 1, 2, 3.
Pricopi Dan
Suran Marian Doru
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