Absolute-Magnitude Calibration for W~UMa-type Systems. II. Influence of Metallicity

Details Absolute-Magnitude Calibration for W~UMa-type Systems. II. Influence of Metallicity Absolute-Magnitude Calibration for W~UMa-type Systems. II. Influence of Metallicity

1995-03-01

arxiv.org/abs/astro-ph/9503009v1

Astronomy and Astrophysics

Astrophysics

one PS file containing text and 5 figs, packed with uufiles

Scientific paper

10.1086/133603

A modification to the absolute magnitude calibration for W~UMa-type systems, taking into account differences in metal abundances, is derived on the basis of contact binary systems recently discovered in metal-poor clusters. A preliminary estimate of the magnitude of the metallicity-dependent term for the $(B-V)$-based calibration is $\Delta M_V = -(0.3 \pm 0.1) \times [Fe/H]$. The calibration based on the $(V-I_C)$ color is expected to be less sensitive with the correction term $\approx -(0.12\pm 0.05) \times [Fe/H]$.

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