Metal abundance of the eclipsing binary YZ Cas: discrepancy between atmospheric determinations for the Am component
Abstract
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 (Zatmospheric), while the fit of evolutionary tracks provides the initial chemical composition (Zinitial). While a disagreement is expected between Zatmospheric and Zinitial because the primary component is an Am star (one expects Zatmospheric to be larger), we find some unexpected discrepancy between atmospheric determinations of Z for this star.
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