AAVSO: American Association of Variable Star Observers

A Photometric Study of the Eclipsing Binary QT Ursae Majoris

Volume 45 number 2 (2017)

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Edward J. Michaels
Stephen F. Austin State University, Department of Physics, Engineering and Astronomy, P.O. Box 13044, Nacogdoches, TX 75962; emichaels@sfasu.edu

Abstract

Presented are the first multiband light curves of the eclipsing binary QT Ursae Majoris. The light curves were analyzed using the Wilson-Devinney program to find the best-fit stellar model. Asymmetries in the light curves required spots to be included in the model. The solution results give a Roche Lobe fill-out of 13%, which is consistent with a W-type contact binary. New linear and quadratic ephemerides were computed using 31 times of minima, including 8 new ones from this study.