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Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1111..237g&link_type=abstract
PROBING STELLAR POPULATIONS OUT TO THE DISTANT UNIVERSE: CEFALU 2008, Proceedings of the International Conference. AIP Conferen
Other
Origin, Formation, Evolution, Age, And Star Formation, Star Formation, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
We discuss the reliability of one of the most used method to determine the helium-to-metals enrichment ratio (ΔY/ΔZ), i.e. the photometric comparison of a selected data set of local disk low main sequence (MS) stars observed by Hipparcos with a new grid of stellar models with up-to-date input physics. Most of the attention has been devoted to evaluate the effects on the final results of different sources of uncertainty (observational errors, evolutionary effects, selection criteria, systematic uncertainties of the models, numerical errors). As a check of the result the procedure has been repeated using another, independent, data set: the low-MS of the Hyades cluster. The obtained ΔY/ΔZ for the Hyades, together with spectroscopic determinations of [Fe/H] ratio, have been used to obtain the Y and Z values for the cluster. Isochrones have been calculated with the estimated chemical composition, obtaining a very good agreement between the predicted position of the Hyades MS and the observational data in the color-magnitude diagram.
Degl'Innocenti Scilla
Gennaro Mario
Moroni G. Prada P.
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