CAOSP abstracts, Volume: 45, No.: 1, year: 2015

Author(s): Kjurkchieva, D.; Popov, V.; Petrov, N.; Ivanov, E.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 45, no. 1, p. 28-41.
Date: 4/2015
Title: Light curve solutions of six short-period binaries and peculiarities of two of them, NSVS 3640326 and V1007 Cas
Keyword(s): stars: binaries: eclipsing, stars: individual (NSVS 3640326, V1007 Cas, NSVS 1776195, UCAC4-525-135123, NSVS 113026, V568 Peg)
Pages: 28 -- 41

Abstract: Photometric observations in Sloan g' and i' bands of six binaries with orbital periods of 6—8 hours are presented. One of them is a newly discovered eclipsing system. NSVS 3640326, V1007 Cas and V568 Peg have fillout factors above 0.26 and their components differ in mass more than 2 times. All systems revealed the O'Connell effect that was reproduced by cool spots on the side surfaces of their primary components. The light curves of NSVS 3640326 and V1007 Cas seem unusual due to their flat MinI. This peculiarity implies an extremely weak limb-darkening effect of their primaries. Another peculiarity of V1007 Cas is that its secondary is cooler, but bigger and considerably more massive, than its primary. Moreover, V1007 Cas turned out to be well below the line representing the mass-luminosity relation for the MS stars on the mass ratio — luminosity ratio diagram.