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      https://www.ias.ac.in/article/fulltext/joaa/016/03-04/0407-0424

    • Keywords

       

      Eclipsing binaries; detached; VV Ori; elements; individual

    • Abstract

       

      TheUBV light curves obtained by Duerbeck (1975) andHa (wide) and Ha (narrow) light curves obtained by Chambliss & Davan (1987) of the detached eclipsing binary VV Orionis (VV Ori) were analysed using the Wilson-Devinney method fixing the two parametersTh (25,000 K) and q(0.4172), resulting in the following absolute elements:A = 13.605 ± 0.03 LR,Rh = 5.03 ±0.03R, Rc = 2.43 ±0.02R,Mbol,h = -5.18 ± 0.11,Mbol,c = -1.54 ± 0.06,mh =10.81 + 0.42m andmc = 4.51 ± 0.41m. The de-reddened colours obtained from applying the reddening corrections ofE(B-V) = 0m.05 andE(U-B) = Om.04, and the derived temperatures of the components, gave spectral types ofB 1.5V for the primary and 54-5V with anUV excess of 0m·3 for the secondary component. A comparison of the logL and logTe of the components with the observed ZAMS shows the primary component to be a little above and the secondary component to be a little below/or on the ZAMS. A comparison of the properties of the components of VV Ori and a few other detached systems with the normal stars in the logL, logR and logTe versus logm planes, indicated a need for either a readjustment of the scales of the above parameters or modifications in the theoretical models. From the position of the components on the evolutionary tracks of Pop I composition computed by Schaller et al. (1992) it is noticed that while the primary component of W Ori had slightly evolved along the main-sequence, its secondary is still unevolved. The age of VV Ori is found to be 10 ± 1 million years and it is at a distance of 368 ± 10 pc.

    • Author Affiliations

       

      M. B. K. Sarma1 P. Vivekananda Rao1

      1. Centre for Advanced Study in Astronomy, Osmania University, Hyderabad - 500 007, India
    • Dates

       
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