The unusual, high-mass-ratio contact binary VZ PISCIUM

Details The unusual, high-mass-ratio contact binary VZ PISCIUM The unusual, high-mass-ratio contact binary VZ PISCIUM

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..532h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Feb. 1989, p. 532-538. Research supported by the University of Calgary, Valparai

Other

9

Binary Stars, Late Stars, Mass Ratios, Emission Spectra, Light Curve, Radial Velocity, Stellar Evolution

Scientific paper

Radial-velocity curves have been determined for the short-period W UMa type binary VZ Psc using the cross-correlation method. These yield a mass ratio of 0.92 + or - 0.03, a value closer to unity than that reported for any other W UMa binary thus far. Strong Ca II H and K emission is associated with each component. A light-curve solution indicates a greatly overcontact configuration with a very large temperature difference between components, a combination that is difficult to understand physically. However, the inclination is very low and thus the light-curve parameters are not well determined. The system has a high space velocity and belongs kinematically to the old-disk population. The high mass ratio makes VZ Psfc a candidate for recent evolution into contact, which may relate to some of its unusual properties.

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