Other
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.2275b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 2275-2279.
Other
21
Binary Stars, Red Giant Stars, Speckle Interferometry, Stellar Evolution, Stellar Orbits, Abundance, G Stars, Radial Velocity, Stellar Magnitude, Stellar Mass, Stellar Parallax
Scientific paper
A new orbit for Capella has been computed, incorporating the latest available speckle-interferometry data. This, combined with van Altena's (1988) parallax data, gives a total mass of 4.58 solar masses + or - 9 percent for the two components. The comparatively low mass found is more consistent with the 'convective over-shoot' models of Bertelli et al. (1986). The Stroemgren y, b, and v magnitude differences of the Capella binary were estimated by Bagnuolo and Sowell (1988), and these data were converted into the spectral types and temperatures of the two stars. These results when compared to various stellar evolutionary tracks, tend to support the belief that the 'G star' (Capella Aa) is at the beginning of the red giant branch (RGB), not at the core-helium-burning phase in its evolution. Other available data for or against the RGB hypothesis are discussed.
Bagnuolo William G. Jr.
Hartkopf William I.
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