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A massive white dwarf member of the Coma Berenices open cluster
journal contribution
posted on 2023-05-17, 14:29 authored by Dobbie, PD, Casewell, SL, Burleigh, MR, Boyce, DDWe report the identification, from a photometric, astrometric and spectroscopic study, of a massive white dwarf member of the nearby, approximately solar metallicity, Coma Berenices open star cluster (Melotte 111). We find the optical to near-infrared energy distribution of WD 1216+260 to be entirely consistent with that of an isolated DA and determine the effective temperature and surface gravity of this object to be Teff = 15 739+197−196 K and log g = 8.46+0.03−0.02. We set tight limits on the mass of a putative cool companion, M ≳ 0.036 M⊙ (spatially unresolved) and M ≳ 0.034 M⊙ (spatially resolved and a ≲ 2500 au). Based on the predictions of CO core, thick H layer evolutionary models we determine the mass and cooling time of WD 1216+260 to be MWD = 0.90 ± 0.04 M⊙ and τcool = 363+46−41 Myr, respectively. For an adopted cluster age of τ = 500 ± 100 Myr we infer the mass of its progenitor star to be Minit = 4.77+5.37−0.97 M⊙. We briefly discuss this result in the context of the form of the stellar initial mass–final mass relation.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
395Pagination
1591-1598ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Blackwell Publishing LtdPlace of publication
9600 Garsington Rd, Oxford, England, Oxon, Ox4 2DgRights statement
Copyright 2009 The Authors. Journal compilation ?copyright 2009 RASRepository Status
- Restricted