Observations and light curve solutions of the W UMa binaries V796 Cep, V797 Cep, CSS J015341.9+38164

Diana Petrova Kjurkchieva1, Velimir Angelov Popov1,2, Sunay Ibryamov Ibryamov1 , Doroteya Lyubenova   2017-05-29 00:20:07

1 Department of Physics, Shumen University, 115 Universitetska Str., 9712 Shumen, Bulgaria; d.kyurkchieva@shu.bg

2 IRIDA Observatory, Rozhen NAO, Bulgaria

3 Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd., 1784 Sofia, Bulgaria

Received 2016 November 30; accepted 2017 January 13

Abstract Photometric observations in Sloan g′ and i′ bands of four W UMa binaries, V796 Cep, V797 Cep, CSS J015341.9+381641 and NSVS 3853195, are presented. Our observations showed that CSS J015404.1+382805 and NSVS 3853195 are the same star. We determined the initial epochs T0 of all targets and found improved values for the period of NSVS 3853195. The light curve solutions of our data revealed that the components of each target are almost the same in terms of mass, temperature, radius and luminosity. The stellar components are G and K spectral types and undergo partial eclipses. All systems have barely-overcontact configurations and can be classified as H subtype W UMa binaries. We established that the relation between the luminosity ratio l2/l1 and mass ratio q of our targets is approximately l2/l1 = q1.5.

Key words: stars: binaries: eclipsing—stars: fundamental parameters—stars: individual (V796 Cep, V797 Cep, CSS J015341.9+381641, NSVS 3853195)

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