Beta Capricorni - Fundamental parameters from occultation astrometry and spectroscopy

Details Beta Capricorni - Fundamental parameters from occultation astrometry and spectroscopy Beta Capricorni - Fundamental parameters from occultation astrometry and spectroscopy

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..497e&link_type=abstract

Astrophysical Journal, Part 1, vol. 228, Mar. 1, 1979, p. 497-508. Research supported by the University of Texas

Astronomy and Astrophysics

Astrophysics

22

Astronomical Spectroscopy, Binary Stars, Stellar Occultation, Stellar Spectra, G Stars, Giant Stars, Orbital Elements, Stellar Magnitude, Stellar Temperature

Scientific paper

A method for deriving a visual-orbit solution from occultation observations of a long-period spectroscopic binary is outlined and applied to the spectroscopic triple system Beta Cap. Long-period orbital elements are incorporated into the solution for the visual orbit, and spectroscopic observations are taken into account. The spectral types of the component stars are considered, the fundamental parameters of the system are computed, and the results are evaluated on the basis of Population I evolutionary tracks. It is shown that the K0 primary is a bright giant of luminosity class II-III and has a mass of 3.69 solar masses, an absolute visual magnitude of -1.63, a radius of 31.4 solar radii, and an effective temperature of 4870 K. The B8 V secondary is estimated to be near its maximum mass limit of 3.4 solar masses, and component C is identified as a late G dwarf. An age of about 230 million years is inferred for the system.

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