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

We observe the brightest member of the Praesepe cluster,ϵCnc, 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 beM1/M= 2.420 ± 0.008 andM2/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 ofϵCnc. 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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Award ID(s):
1817217 1909165 1636624
Publication Date:
Journal Name:
The Astronomical Journal
Page Range or eLocation-ID:
Article No. 34
DOI PREFIX: 10.3847
Sponsoring Org:
National Science Foundation
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