The New Ephemeris and Light Curve Analysis of a W Uma‐type Binary GV Leo

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

Madani M.2, Poro A.1
1The International Occultation Timing Association-Middle East section, info@iota-me.com
2IOTA/ME Educational and Research Course 2020, Iran


Abstract
The new ephemeris of the eclipsing binary system GV Leo is presented. The observation was made with CCD through the C filter. These three W UMa systems studied for the first time so we used the Czech astronomical society’s database to extract raw data from the complete light curves, to obtain the time of minimums to calculate O-Cs with the new ephemeris. To analysis the light curve, we used PHOEBE software. We calculated the fillout factor to be 17.77% with a mass ratio of 0.188. There is no need to add any spot in this solution.


Keyword: Star, Contact, Binary, W UMa, Ephemeris

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