Abstract
view Abstract Citations (22) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Binary Star Orbits from Speckle Interferometry. III. The Evolution of the Capella Stars Bagnuolo, William G., Jr. ; Hartkopf, William I. Abstract 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. Publication: The Astronomical Journal Pub Date: December 1989 DOI: 10.1086/115297 Bibcode: 1989AJ.....98.2275B Keywords: Binary Stars; Red Giant Stars; Speckle Interferometry; Stellar Evolution; Stellar Orbits; Abundance; G Stars; Radial Velocity; Stellar Magnitude; Stellar Mass; Stellar Parallax; Astrophysics; STARS: INDIVIDUAL full text sources ADS | data products SIMBAD (1)
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