* Astronomy

Title: CCD Photometric Investigation of A W UMa-Type Binary GSC 0763-0572
Authors: W. Kriwattanawong, P. Pooseekheaw

A photometric solution of an A-type W UMa binary, GSC 0763-0572 is examined with a revised orbital period. The overcontect degree is found as f = 40.66 %, with low mass ratio of q = 0.2554. The result demonstrates unambiguously increase of the orbital period with a relative period change of Delta(P)/P = +5.69x10^(-7) d yr^(-1). This indicates that GSC 0763-0572 is ongoing a process of mass transfer from the secondary component to primary one with a rate of relative mass change of Delta(m_1)/m = +5.18x10^(-8) yr^(-1), for conservative case of mass transfer. We find that GSC 0763-0572 might transform into a rapidly rotating star, if total spin angular momentum increases until greater than one-third of the orbital angular momentum, with non-breaking contact configuration.

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