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arXiv:astro-ph/0011388 (astro-ph)
[Submitted on 21 Nov 2000]

Title:Metal abundance of the eclipsing binary YZ Cas: discrepancy between atmospheric determinations for the Am component

Authors:E. Lastennet (1,2), D. Valls-Gabaud (3), C. Jordi (4) ((1) Obs. Valongo, UFRJ, Rio de Janeiro, Brazil, (2) Astronomy Unit, QMW, London, UK (3) OMP, Toulouse, France (4) Univ. de Barcelona, Spain)
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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 (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.
Comments: 2 pages, to appear in Proc. "The influence of binaries on stellar population studies", Brussels, August 2000 (Kluwer, D. Vanbeveren ed.)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011388
  (or arXiv:astro-ph/0011388v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011388

Submission history

From: Erwan Lastennet [view email]
[v1] Tue, 21 Nov 2000 13:33:36 UTC (27 KB)
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