Abstract
The short period eclipsing binary V 361 Lyr with a period of 0.3096 d has probably the shortest period among known near-contact binaries made of non-degenerate matter. In this paper a detailed photometric analysis is made using the V and I light curves observed by Kaluzny in 1989. Considering that any hot spot on the secondary component from accretion is likely to be extended in the longitude direction, we adopted a multi-spot model and succeeded in obtaining a good fit to the observed, distorted light curve. The photometric solution shows V 361 Lyr to be a near-contact detached system, with a photometric mass ratio q = 0.696 ± 0.005. The secondary is an evolved subgiant and the mean temperature of three hot spots is about 7340 K. The absolute masses and radii were estimated and the hot spots were found to have an accretion luminosity of about 1.07×10 33 erg/s, corresponding to a probable mass exchange rate of about 7.0×10 −7 yr −1. A discussion is made on the statistical properties of 15 known A-K type, near-contact, detached systems.
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