The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun Edited by G. A. Feiden The Sun Like Star : HT Vir Mehmet TANRIVER1, Ferhat Fikri ÖZEREN1 1 Erciyes University, Astronomy and Space Sciences Department, 38039, Kayseri, Turkey Abstract This study is focused on the photometric (light curve) analysis of the Sun like star HT Vir which is a binary star located in the ASAS catalogue, shows variation in W UMa (EW/KW) type. The solution of light curve was executed using the PHOBE code. We conducted an unspotted solution for the HT Vir binary system. The positions in the HR diagram of the components are also discussed. 1 INTRODUCTION HT Vir is the sun like a photometric binary star. The gen- eral information belongs to this star are given the follow- ing Table2. HT Vir is an eclipsing variable with ESD (Eclips- ing Semi-Detached) type according to data of ASAS catalog. The U, B, V, R, I, J, H and K bands magnitudes of the Sun were taken from (Tanrıver, 2012), Tanrıver (2014a), Tanrıver (2014b) and Tanrıver & Özeren (2016) as shown in Table??. As seen, it is in compliance the colour indices of the Sun with the colour indexes of HT Vir (see Table3). Table 1: The informations of HT Vir ASAS ID 134607+0506.9 J 6.11 RA (2000) 13:46:06.9 H 5.85 DEC (2000) 05:06:54.0 K 5.79 Period (day) 0.407672 V-J 1.10 T0 (2450000+) 2490.0 V-H 1.36 V 7.1 V-K 1.42 VAmp 0.45 J-H 0.26 Class EC/ESD H-K 0.06 J-K 0.32 Table 2: The colour indexes of the Sun ( Tanrıver (2012), Tan- rıver (2014a), Tanrıver (2014b) ). B-V 0.6457 ± 0.0421 V-J 1.1413 ± 0.1063 H-K 0.0572 ± 0.0351 U-B 0.1463 ± 0.0596 V-H 1.4613 ± 0.1183 J-K 0.3777 ± 0.0494 R-I 0.3403 ± 0.0356 V-K 1.5210 ± 0.1149 J-L 0.4187 ± 0.0558 U-V 0.7926 ± 0.1032 V-L 1.5167 ± 0.0959 J-M 0.3711 ± 0.0529 V-R 0.4674 ± 0.0639 V-M 1.4621 ± 0.0759 K-L 0.0403 ± 0.0517 V-I 0.7053 ± 0.0872 J-H 0.3196 ± 0.0432 K-M 0.0063 ± 0.0546 Table 3: Comparison the colour indexes of the Sun and star. V-J V-K J-K The Sun 1.14 1.52 0.37 134607+1506.9 (HT Vir) 1.10 1.42 0.32 2 OBSERVATION AND PHOTOMETRIC SO- LUTION The light curves and data in the V band of HT Vir vari- able in the ASAS catalog have been taken into account (Po- jmanski, 1997). The graphics according to the time (HJD) of the magnitudes (Vmag) is given in Figure1. The light curve according to phase of the stars is given in Figure2. The light curve created according to the average (averaged ev- ery each third point ) is given in Figure3. The photometric solution was carried out using the PHOEBE interface with based Wilson-Devinney, photometric solution methods (see Figure4). While the photometric solution, hot component of the binary system is taken as a Sun like star. Physical param- eters of hot component (temperature: 5800K, mass: 1Msun and radius: 1Rsun) which is compatible with the Sun are ﬁrstly kept constant during solution. The parameters ob- tained from the photometric solution results are given in Table4. The positions in the HR diagram of the component stars are given in Figure5. 3 CONCLUSION HT Vir shows variation like W UMa (EW/KW) type. The component stars belong to a contact binary which ﬁlled Roche lobes and main sequence stars. The positions in the HR diagram of components are shown ﬁgure 5. Both compo- nents are Sun like stars. Acknowledgments This work was supported by Scientiﬁc Research Projects Coordination Unit of Erciyes University with project num- ber FBA-09-788, FBY-10-2924 and FBA-11-3283 . This study makes use of data products from the All Sky Autometed Sur- vey (ASAS). The use of the SIMBAD and ADS databases is 1