Absolute Properties of the Eclipsing Triple Star Co Andromedae: Constraints on Convective Core Overshooting

 
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Lacy, Claud H. Sandberg
Torres, Guillermo
Claret, Antonio
Charbonneau, David
O’Donovan, Francis T.
Mandushev, Georgi
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https://doi.org/10.1088/0004-6256/139/6/2347
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Lacy, Claud H. Sandberg, Guillermo Torres, Antonio Claret, David Charbonneau, Francis T. O’Donovan, and Georgi Mandushev. 2010. “ABSOLUTE PROPERTIES OF THE ECLIPSING TRIPLE STAR CO ANDROMEDAE: CONSTRAINTS ON CONVECTIVE CORE OVERSHOOTING.” The Astronomical Journal 139 (6): 2347–59. https://doi.org/10.1088/0004-6256/139/6/2347.
Abstract
Accurate absolute properties have been determined for the eclipsing triple star CO And (F8+F8) based on extensive differential photometry obtained by three robotic observatories and CfA spectroscopy. The eclipsing binary star orbit is circular with a period of 3.655 days. The triple nature of this system is revealed by more than a century of timings of minimum light, and by the presence of third light in the photometric orbits. The masses of the eclipsing pair are 1.289 +/- 0.007 and 1.264 +/- 0.007 solar masses, and the corresponding radii are 1.727 +/- 0.021 and 1.694 +/- 0.017 solar radii. These stars are synchronously rotating and are near the end of their main-sequence phase, at an age of about 3.6 Gyr. The much fainter widely separated third body appears to have a mass of about 0.8 solar masses. The distance to the system is 377 +/- 25 pc.
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