Photometric Observations and Light Curve Studies of the Semi-Detached Eclipsing Binary R CMa

Abstract

We present observations and light curve analysis of the eclipsing binary R CMa in the narrow band filters v and b. Observations were made during 1993 at Biruni Observatory and the light curves have been analyzed using the Wilson-Devinney light curve interpretation program. Assuming a semi-detached configuration for R CMa, the parameters i, 1 , L 1 , T 2 and A 2 were adjusted for the best fit between the synthesized light curves and observations. Both light curves were fitted well with a lower value of bolometric albedo than what would be expected for a normal cool star with a convective envelope. The masses of the primary and secondary components and the absolute dimensions of the stars have been calculated using the derived relative dimensions from Wilson-Devinney codes and the spectroscopic observations.

Spectroscopic time-series analysis of R Canis Majoris

“…Sarma et al (1996) derived 7310±100 K, based on the observed B−V value of +0.27 obtained from the light curves of Radhakrishnan et al (1985), and assumed the primary component of R CMa as an F1 star. This value of 7310 K was adopted later by several authors like Varricatt & Ashok (1999) or Mirtorabi & Riazi (2006) in their light-curve analyses and also by BB2011. We repeated the spectrum analysis with T eff fixed to 7300 K using [Fe/H] as a free parameter.…”

“…3, but for the best fit using T eff =7500 K. (1985), and assumed the primary component of R CMa as an F1 star. This value of 7310 K was adopted later by several authors like Varricatt & Ashok (1999) or Mirtorabi & Riazi (2006) in their light-curve analyses and also by BB2011.…”