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The first high-precision BVRI light curves of the eclipsing binary AS CrB were presented and were analyzed by the 2015 version of the W-D code. It is found that AS CrB is an extreme mass-ratio, deep contact binary with a fill-out factor of f=59.6±2.5% and a mass ratio of q=0.172±0.008. Based on the photometric solution and the Dartmouth isochrones model, the masses, radii, and luminosities of the...
LY Aur is a contact massive close binary with a period of a little more than four days. The first O-C analysis of this early-type binary presented in this paper suggests that the period of the system is increasing continuously at a rate of dP/dt=+7.2×10-7 days/year, while a cyclic oscillation with the period of 12.5years is obvious. The long-term increasing can be explained by mass transfer from the...
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