Praesepe and the seven white dwarfs

P. D. Dobbie, D. J. Pinfield, R. Napiwotzki, N. C. Hambly, M. R. Burleigh, M. A. Barstow, R. F. Jameson, I. Hubeny

Research output: Contribution to journalArticlepeer-review

Abstract

We report the discovery, from our preliminary survey of the Praesepe open cluster, of two new spectroscopically confirmed white dwarf candidate members. We derive the effective temperatures and surface gravities of WD0837+218 and WD0837+185 (LB5959) to be 17845+555-565K and log g = 8.48+0.07-0.08 and 14170+1380-1590K and log g = 8.46+0.15-0.16, respectively. Using theoretical evolutionary tracks we estimate the masses and cooling ages of these white dwarfs to be 0.92 +/- 0.05Msolar and 280+40-30 Myr and 0.90 +/- 0.10 Msolar and 500+170-100 Myr, respectively. Adopting reasonable values for the cluster age we infer the progenitors of WD0837+218 and WD0837+185 had masses of 2.6
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume355
Issue number4
DOIs
Publication statusPublished - 1 Dec 2004

Keywords

  • white dwarfs
  • open clusters and associations: individual: Praesepe

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