Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-21
Astronomy and Astrophysics
Astrophysics
2 pages, to appear in Proc. "The influence of binaries on stellar population studies", Brussels, August 2000 (Kluwer, D. Vanbe
Scientific paper
We review current and new estimates of the eclipsing binary YZ Cassiopeiae metallicity (Z). Since the individual components cover a quite large range of mass (1.35-2.31 Solar masses), YZ Cas is potentially one of the best stellar laboratories to understand the structure and evolution of 1 to 2 Solar masses stars. The derivation of Z from IUE spectra, as well as from photometric indices, provides the chemical composition of the atmosphere (Z_{atmospheric}), while the fit of evolutionary tracks provides the initial chemical composition (Z_{initial}). While a disagreement is expected between Z_{atmospheric} and Z_{initial} because the primary component is an Am star (one expects Z_{atmospheric} to be larger), we find some unexpected discrepancy between atmospheric determinations of Z for this star.
Jordi Carme
Lastennet Erwan
Valls-Gabaud David
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