The K spectral type contact binary NSVS 1557555: Photometric solution and preliminary elements |
| |
| Institution: | 1. Via Molinetto 35, 26845 Triulza di Codogno (LO), Italy;2. Via Zoncada 51, 26845 Codogno (LO), Italy;3. Via Don G. Minzoni 26/D, 20020 Magnago (MI), Italy;1. Department of Physics, & Centre for Theoretical Studies, IIT Kharagpur, Pin: 721302, India;2. National Centre For Radio Astrophysics, Post Bag 3, Ganeshkhind, Pune 411007, India;3. Department of Physics, Indian Institute of Science, Bangalore 560012, India;4. Department of Physics and Meteorology & Centre for Theoretical Studies, IIT Kharagpur, 721302 India;5. Department of Physics, Jadavpur University, Kolkata 700032, India;6. Dept of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, South Africa;7. SKA SA, The Park, Park Road, Pinelands 7405, South Africa;8. Department of Physics, IIT (BHU), Varanasi 221005, India;1. Department of Mathematics, Gauhati University, Guwahati-14, India;2. Department of Mathematics, A.D.P. College, Nagaon-02, India;1. Department of Physics, V V College of Engineering, Tirunelveli, 627 657 India;2. Department of Physics, VVV College for Women, Virudhunagar, 626 001 India;3. Research and Development Centre, Bharathiar University, Coimbatore, 641 046 India;4. Physics Research Centre, VHNSN College, Virudhunagar, 626 001 India;1. Department of Astronomy, Nanjing University, Nanjing, Jiangshu 210000, China;2. College of Electronic and Communication Engineering, Hainan Tropical Ocean University, Sanya 572022, China;3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;1. Astronomical Institute, Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, CZ-18000 Prague 8, Czech Republic;2. Astronomical Institute (v. v. i.), Czech Academy of Sciences, Fričova 298, CZ-25165 Ondřejov, Czech Republic |
| |
| Abstract: | We present the first CCD sets of complete light curves for the W Ursae Majoris system NSVS 1557555.The observations were performed in the B, V and Ic bands using the 0.25 m telescope of the Stazione Astronomica Betelgeuse Northern Italy, during 8 nights in October and November 2016.Based on our new eleven Time of Minima (ToM), and two recent ones found in bibliography, the short orbital period of the system is confirmed and revised to P = 0.2725163 days .A reasonable fit of the synthetic light curves of the data indicate that NSVS 1557555 is a late-type (K1+K3) shallow contact binary system of W-Subtype of the W Ursae Majoris systems, with a mass ratio of q = 1.8, a degree of contact factor f = 12.5%, a temperature difference between the components of 240K and inclination i = 85°.The light curves show asymmetries at the maxima with the maximum at phase 0.75 higher the other one (inverse O’Connell effect).To explain the light asymmetries we used a model that involves an hot spotted region on the surface of the cooler star.The definitive solution is only possible with a large amount of third light (L3 = 0.58 in B Filter). It may come from a hot tertiary component.The absolute dimensions of the system are estimated. From the logM-logL diagram it is seen that both components of NSVS 1557555 follow the general pattern of the W subtype W Ursae Majoris systems.The orbital angular momentum is compared with those of other W UMa type binaries and is normal. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
