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Advances in Astronomy
Volume 2019, Article ID 4593092, 9 pages
https://doi.org/10.1155/2019/4593092
Research Article

Mass Transfer and Intrinsic Light Variability in the Contact Binary MT Cas

School of Physics and Electronic Information/Information College, Huaibei Normal University, Huaibei 235000, China

Correspondence should be addressed to Yuangui Yang; moc.361@ncgyy

Received 12 November 2018; Accepted 19 March 2019; Published 4 April 2019

Academic Editor: Dean Hines

Copyright © 2019 Haifeng Dai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

First CCD photometry for the contact binary MT Cas is performed in 2013 in December. The spectral type of F8V is determined from the low-precision spectrum observed on 2018 Oct 22. With Wilson-Devinney code, the photometric solutions are deduced from light curves (LCs) and AAVSO’s and ASAS-SN’s data, respectively. The results imply that MT Cas is a W-type weak-contact binary with a mass ratio of and a fill-out factor of , respectively. The asymmetric LCs in 2013 are modeled by a dark spot on the more massive component. By analyzing the curve, it is discovered that the orbital period may be undergoing a secular increase at a rate of , which may result from mass transfer from the less massive component to the more massive one. With mass transferring, MT Cas may evolve into a broken-contact configuration as predicted by TRO theory.