CCD photometric analysis of the W UMa-type binary V376 Andromeda


Cicek C.

NEW ASTRONOMY, cilt.16, ss.12-16, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 16 Konu: 1
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.newast.2010.06.005
  • Dergi Adı: NEW ASTRONOMY
  • Sayfa Sayıları: ss.12-16

Özet

This study presents the absolute parameters of the contact binary system V376 And. CCD photometric observations were made at the canakkale Onsekiz Mart University Observatory in 2004. The instrumental magnitudes of all observed stars were converted into standard magnitudes. New BV light curves of the system were analysed using the Wilson-Devinney method supplemented with a Monte Carlo type algorithm. Since there are large asymmetries between maxima (i.e., O'Connell effect) in these light curves, two different models (one with a cool spot and one with a hot spot) were applied to the photometric data. The best fit, which was obtained with a large hot spot on the secondary component, gives V376 And as an A sub-type contact binary in poor thermal contact and a small value of the filling factor (f approximate to 0.07). Combining the solutions of our light curves and Rucinski et al. (2001)'s radial velocity curves, the following absolute parameters of the components were determined: M(1) = 2.44 +/- 0.04 M(circle dot), M(2) = 0.74 +/- 0.03 M(circle dot), = 2.60 +/- 0.03 R(circle dot), R(2) = 1.51 +/- 0.02 R(circle dot), L(1) = 40 +/- 4 L(circle dot) and L(2) = 5 +/- 1 L(circle dot). We also discuss the evolution of the system, which appears to have an age of 1.6 Gyr. The distance to V376 And was calculated as 230 +/- 20 pc from this analysis, taking into account interstellar extinction. (c) 2010 Elsevier B.V. All rights reserved.