# Binary Orbit, Physical Properties, and Evolutionary State of Capella (α Aurigae)

@article{Torres2009BinaryOP,
title={Binary Orbit, Physical Properties, and Evolutionary State of Capella ($\alpha$ Aurigae)},
author={Guillermo Torres and Antonio Claret and Patrick A. Young},
journal={The Astrophysical Journal},
year={2009},
volume={700},
pages={1349-1381}
}
• Published 4 June 2009
• Physics
• The Astrophysical Journal
We report extensive radial velocity measurements of the two giant components of the detached, 104 day period binary system of Capella. Our highly accurate three-dimensional orbital solution based on all existing spectroscopic and astrometric observations including our own yields much improved masses for the primary and secondary of 2.466 {+-} 0.018 M {sub sun} and 2.443 {+-} 0.013 M {sub sun}, with relative errors of only 0.7% and 0.5%, respectively. The mass ratio is considerably closer to…
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