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

Abstract

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 $\approx -(0.12\pm 0.05)\times [Fe/H]$.

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

Cited by in corpus (16)

• The Frequency of Binary Stars in the Core of 47 Tucanae
• Contact Binaries of the Galactic Disk: Comparison of the Baade's Window and Open Cluster Samples
• Search for Variable Stars in the Globular Cluster M3
• Contact binary stars of the W UMa type as distance tracers
• Variable stars in the open cluster NGC 6791 and its surrounding field
• Photometry Results for the Globular Clusters M10 and M12: Extinction Maps, Color-Magnitude Diagrams, and Variable Star Candidates
• A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205)
• Long-term variability survey of the old open cluster NGC 6791
• Variable Stars in the Field of the Globular Cluster NGC 3201
• CCD Photometry of Faint Variable Stars in the Globular Cluster NGC 6752
• New absolute magnitude calibrations for W Ursa Majoris type binaries
• The effect of stellar evolution upon Population II Contact Binaries in the Period-Color Relation. I. Equal-Mass, Marginal Contact Systems
• Zwicky Transient Facility and Globular Clusters: the Period-Luminosity and Period-Luminosity-Color Relations for Late-Type Contact Binaries
• Exotica in the Globular Cluster M4, Studied with Chandra, HST, and the VLA
• Outliers: multicolour photometry guiding the search for evolved binary systems in the globular cluster 47 Tucanae
• Period-Luminosity-Metallicity-Color Relations of Late-type Contact Binaries in the Big Data Era