calculate-and-study-the-absolute-parameters-of-15-contact-binary-systems

JOURNAL OF OCCULTATION AND ECLIPSE (JOE); ISSN 2522-7955; No. 7, 2020

Atila Poro¹, Amirreza Mohandes², Elnaz Bozorgzadeh³, Saeideh Ranjbaryan iry olya³, Mahshid Nourmohammad⁴, Fatemeh Abdollahi⁵, Reza Hasanzadeh Kashan⁵, Masoumeh Hassanpour^5
1International Occultation Timing Association Middle East section
²Sepehr Astronomical Association, Kashan, Iran
³Ayaz Astronomical Society, Tabriz, Iran
⁴University of Kashan, Kashan, Iran
⁵Farhangian University, Tabriz, Iran

Abstract
We studied 15 binary systems and obtained their absolute parameters. These stars had two things in common; All of them are of the type of contact binary systems, also their q value is low. Based on this, we obtained parameters such as M, R, L, Mv, and a/R_ʘ. Also based on the Mv, and the BC, we obtained the distance of the systems. All distances obtained were good agreement by Gaia DR2. We also marked the position of these binary systems in the H-R diagram.

Keyword: Star, Binary, W UMa, Absolute parameters