Multiband photoelectric photometry of the eclipsing binary R Canis Majoris

Details Multiband photoelectric photometry of the eclipsing binary R Canis Majoris Multiband photoelectric photometry of the eclipsing binary R Canis Majoris

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82...51g&link_type=abstract

Astronomical Journal, vol. 82, Jan. 1977, p. 51-66.

Astronomy and Astrophysics

Astronomy

23

Eclipsing Binary Stars, H Beta Line, Light Curve, Stellar Spectrophotometry, Ubv Spectra, Bandwidth, Mass Transfer, Orbital Elements, Stellar Envelopes, Stellar Evolution, Stellar Magnitude, Tables (Data)

Scientific paper

UBV and narrow-band light curves for the eclipsing binary R CMa are obtained from a total of 977 narrow- and broad-band U, B, V, and H-beta photoelectric observations of the system. The light curves are found not to exhibit any conspicuously peculiar features, but the presence of asymmetries in the secondary minima of the V and narrow-band H-beta light curves is noted. Color indices in excellent agreement with those previously published are determined, out-of-eclipse variations are examined, and an eclipse analysis is performed. The absolute magnitudes and photoelectric indices of the hot and cool components are obtained, and a system mass ratio of 0.15 is estimated. The results indicate that: (1) R CMa is composed of a normal F0 main-sequence star plus an unusual K3 subgiant and is essentially free of interstellar absorption; (2) the more massive and larger F0 star is nearly spherical while the smaller and cooler component is highly distorted and just within its Roche lobe for the estimated mass ratio; (3) the observed luminosity of the secondary is substantially below that expected for an evolved star undergoing mass loss; (4) the rapid phase of mass transfer has apparently already taken place; and (5) circumstellar gas is probably present in the system.

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