The Interferometric Binary ϵ Cnc in Praesepe: Precise Masses and Age
Morales, LM; Sandquist, EL; Schaefer, GH; et al.Farrington, CD; Klement, R; Bedin, LR; Libralato, M; Malavolta, L; Nardiello, D; Orosz, JA; Monnier, JD; Kraus, S; Bouquin, J-BL; Anugu, N; Brummelaar, TT; Davies, CL; Ennis, J; Gardner, T; Lanthermann, C
Date: 5 July 2022
Article
Journal
Astronomical Journal
Publisher
IOP Publishing / American Astronomical Society
Publisher DOI
Abstract
We observe the brightest member of the Praesepe cluster, Epsilon 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, ...
We observe the brightest member of the Praesepe cluster, Epsilon 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 M1/M = 2.420 ± 0.008 and M2/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 Epsilon Cnc. We re-examine 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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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