Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.159...67b&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 159, no. 1, Sept. 1989, p. 67-83.
Astronomy and Astrophysics
Astrophysics
9
Binary Stars, Light Curve, Mass Transfer, Stellar Envelopes, Algorithms, Astronomical Photometry, Photoelectricity, Stellar Temperature, Temperature Distribution
Scientific paper
The existing photoelectric light curves of two K-type binary systems are analyzed: UU Cnc, with a period of about 100 days, and VZ Psc, with a period of about 6 hours. Both show a large overcontact and a large temperature difference between components. In the case of VZ Psc, the variability is due only to the nonspherical shape, but the determination of the photometric solution is made possible by the existence of a spectroscopic mass ratio. UU Cnc is now probably undergoing Case C mass transfer in a dynamical time-scale, with the mass ratio reversal having already occurred. The system is in contact, and is likely to evolve to a 100 percent filling factor, that is the so-colled precommon envelope phase. The situation for VZ Psc is more uncertain, but a similar, although not identical, possibility exists.
Barone Fabrizio
Milano Leo
Russo Gennaro
Sarna Marek J.
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