Lacy, Claud H. SandbergTorres, GuillermoClaret, AntonioCharbonneau, DavidO’Donovan, Francis T.Mandushev, Georgi2019-09-262010Lacy, 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/10.1088/0004-6256/139/6/2347.0004-62561538-3881http://nrs.harvard.edu/urn-3:HUL.InstRepos:41412235Accurate 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.en-USJournal Article2019-09-2610.1088/0004-6256/139/6/2347