Poster
A. L. Soares, M. S. Cunha
Abstract
This poster analyses the determination of masses and ages of a selection of stars from the Kepler survey, by fitting some of their observables - namely, luminosity, metallicity, and effective temperature - to those derived from models of the Padova Stellar Evolutionary Tracks and Isochrones. The luminosity and its uncertainty are obtained through the parallax and V magnitude of the stars and respective errors.
For each star we perform Monte Carlo simulations of the 3 observables, assuming Gaussian distributions of the errors, and then use the chi square statistic to do the fit to the models. For each simulation we obtain the mass and age of the model that best fits the (simulated) observables - the one that minimizes the chi square - so that in the end each star has a distribution of mass and age. When those distributions are proved to be Gaussian, we can also determine the respective uncertainties.
The ages and masses resulting from this method will be compared (when possible) to those obtained by an asteroseismic analysis of data obtained with Kepler.
Third Kepler Asteroseismology Workshop: 'Kepler Asteroseismology in Action'
Aarhus, Denmark
2010 June
