SIMBAD references

2017AJ....154..125M - Astron. J., 154, 125-125 (2017/September-0)

Absolute-magnitude calibration for W UMa-type systems based on Gaia data.


Abstract (from CDS):

Tycho-Gaia Astrometric Solution (TGAS) parallax data are used to determine absolute magnitudes MV for 318 W UMa-type (EW) contact binary stars. A very steep (slope ≃ -9), single-parameter (logP), linear calibration can be used to predict MV to about 0.1-0.3 mag over the whole range of accessible orbital period, 0.22 P 0.88 days. A similar calibration for the most common systems with 0.275 P 0.575 days predicts MV values to about 0.06-0.16 mag. For orbital period values both shorter and longer than the central range, the period dependence is respectively steeper and shallower, i.e., the binaries are fainter in MV than predicted by the whole-range linear law. The steepness of the relation for short-period systems implies important consequences for the detectability of the faintest binaries, defining the short-period cut-off of the period distribution. Although the scatter around the linear logP-fit is fairly large (0.2-0.4 mag), the current data do not support the inclusion of a B-V color term in the calibration.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: close - binaries: eclipsing - techniques: photometric - techniques: photometric

Simbad objects: 27

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