Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985basi...13..261r&link_type=abstract
Astronomical Society of India, Bulletin, vol. 13, Sept. 1985, p. 261-274. Research supported by the University Grants Commission
Astronomy and Astrophysics
Astronomy
3
Eclipsing Binary Stars, Light Curve, Stellar Evolution, Stellar Spectrophotometry, Ubv Spectra, Hertzsprung-Russell Diagram, Mass Ratios, Orbital Elements, Stellar Luminosity, Stellar Mass Ejection
Scientific paper
Photoelectric UBV light curves of the eclipsing binary R CMa obtained between 1980 and 1982 with the 1.2-m Japal-Rangapur observatory reflecting telescope are used to derive the binary eclipse elements. Data suggest that the primary eclipse is in transit and that the secondary is in occultation. The B and V curves provide a unified solution and the U curve is found to be slightly different. Absolute dimensions obtained include a 0.13 + or - 0.01 binary mass ratio, and bolometric luminosities of 6.64 + or 0.29 solar luminosities for the primary, and 0.86 + or - 0.03 solar luminosities for the secondary. The primary is found to be a normal F 2 V star, while the secondary is found to be a G 8 IV-V star contracting towards a helium white dwarf stage along the Hayashi evolutionary track after losing much of its original mass, and hence exhibiting extreme characteristics of overluminosity and excessive surface temperature.
Abhyankar K. D.
Radhakrishnan K. R.
Sarma B. K. M.
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