Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss..99..229r&link_type=abstract
(International Astronomical Union, Colloquium on Double Stars, Physical Properties and Generic Relations, 80th, Bandung, Indones
Astronomy and Astrophysics
Astrophysics
17
Light Curve, Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry, Subgiant Stars, Ubv Spectra, Binary Stars, Dwarf Stars, Radial Velocity, Stellar Envelopes
Scientific paper
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 1.52 solar masses and the secondary a subgiant star of spectral type G8 and mass 0.20 solar mass 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 0.5 solar mass which is most likely to be an M dwarf.
Abhyankar K. D.
Radhakrishnan K. R.
Sarma B. K. M.
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