Abstract
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 anM dwarf.
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Radhakrishnan, K.R., Sarma, M.B.K. & Abhyankar, K.D. Photometric and spectroscopic study of R CMa. Astrophys Space Sci 99, 229–236 (1984). https://doi.org/10.1007/BF00650246
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DOI: https://doi.org/10.1007/BF00650246