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The Interferometric Binary ϵ Cnc in Praesepe: Precise Masses and Age

Abstract : We observe the brightest member of the Praesepe cluster, ϵ Cnc, to precisely measure the characteristics of the stars in this binary system, en route to a new measurement of the cluster's age. We present spectroscopic radial velocity measurements and interferometric observations of the sky-projected orbit to derive the masses, which we find to be M 1/M = 2.420 ± 0.008 and M 2/M = 2.226 ± 0.004. We place limits on the color-magnitude positions of the stars by using spectroscopic and interferometric luminosity ratios while trying to reproduce the spectral energy distribution of ϵ Cnc. We reexamine the cluster membership of stars at the bright end of the color-magnitude diagram using Gaia data and literature radial velocity information. The binary star data are consistent with an age of 637 ± 19 Myr, as determined from MIST model isochrones. The masses and luminosities of the stars appear to select models with the most commonly used amount of convective core overshooting.
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Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Tuesday, September 20, 2022 - 9:15:19 AM
Last modification on : Wednesday, September 21, 2022 - 3:06:22 AM


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Leslie M. Morales, Eric L. Sandquist, Gail H. Schaefer, Christopher D. Farrington, Robert Klement, et al.. The Interferometric Binary ϵ Cnc in Praesepe: Precise Masses and Age. The Astronomical Journal, 2022, 164, ⟨10.3847/1538-3881/ac7329⟩. ⟨insu-03780756⟩



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