Photometric and spectroscopic study of R CMa

Radhakrishnan, K. R. ; Sarma, K. R. ; Abhyankar, K. D. (1984) Photometric and spectroscopic study of R CMa Astrophysics and Space Science, 99 (1-2). pp. 229-236. ISSN 0004-640X

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UBV light curves and spectrograms of R CMa obtained with the 48-inch telescope of Japal-Rangapur Observatory during 1980-82 have been used for deriving the eclipse and orbital elements as well as the absolute dimensions of the components. The primary is found to be a Main-Sequence F2V star of mass 1.52M and the secondary a subgiant star of spectral type G8 and mass 0.20M which fills its Roche lobe, in agreement with Kopal and Shapley (1956) results, Kopal (1959), or Sahade's (1963) results. From a consideration of the possible evolution of this system it is concluded that a large fraction of the original mass of the secondary is lost from the system. A study of the period changes indicates the possible presence of a third component of mass of about 0.5M which is most likely to be an M dwarf.

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