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MI Nouh
MM Elkhateeb*
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Journal of Physics and Astronomy Research

A holistic study of the eclipsing binary EQ Tau

M. M. Elkhateeb*,1,2 and M. I. Nouh1,2

1Department of Astronomy, National Research Institute of Astronomy and Geophysics, 11421 Helwan, Cairo, Egypt

2Department of Physics, College of Science, Northern Border University, 1321 Arar, Saudi Arabia

Accepted 10 November, 2014.

Citation: Elkhateeb MM, Nouh MI (2014). A Holistic study of the eclipsing binary EQ Tau. Journal of Physics and Astronomy Research, 1(3): 015-034.

Copyright: © 2014 Elkhateeb and Nouh. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

We present a new BVR light curves of the system EQ Tau carried out in the period from March to April 2006 using a 50-cm F/8.4 Ritchey–Chretien telescope (Ba50) of the Baja Astronomical Observatory (Hungary), and 512 × 512 Apogee AP-7 CCD camera. The observed light curves were analyzed using the 2004 version of the Wilson-Devinney code. The results show that the more massive component is hotter than the low massive one by 100 K. A long term orbital period study shows that the period increases by the rate 8.946 (±0.365) x10-11 days/cycle. Evolutionary state of the system has been investigated and showed that, the primary component of the system is located nearly on the ZAMS for both the M-L and M-R relations. The secondary component is close to the TAMS track for M-L and above the M-R relations. 

Key Words: Eclipsing binaries, contact, period variation, orbital solution, evolutionary status