Photometric and spectroscopic study of R CMa |
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Authors: | K R Radhakrishnan M B K Sarma K D Abhyankar |
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Institution: | (1) Centre of Advances Study in Astronomy, Osmania University, Hyderabad, India |
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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.Paper presented at the Lembang-Bamberg IAU Colloquium No. 80 on Double Stars: Physical Properties and Generic Relations , held at Bandung, Indonesia, 3–7 June, 1983. |
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