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Praesepe and the seven white dwarfs


Dobbie, PD and Pinfield, DJ and Napiwotzki, R and Hambly, NC and Burleigh, MR and Barstow, MA and Jameson, RF and Hubeny, I, Praesepe and the seven white dwarfs, Monthly Notices of the Royal Astronomical Society, 355, (4) pp. L39-L43. ISSN 0035-8711 (2004) [Refereed Article]

Copyright Statement

Copyright 2004 RAS

DOI: doi:10.1111/j.1365-2966.2004.08522.x


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+555-565 K and log g = 8.48+0.07-0.08 and 14170+1380−1590 K 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 ± 0.05 M⊙ and 280+40−30 Myr and 0.90 ± 0.10 M⊙ 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 ≤ MMcrit M⊙ and 2.4 ≤ M ≤ 3.5 M⊙, respectively, where Mcrit is the maximum mass of a white dwarf progenitor. We briefly discuss these findings in the context of the observed deficit of white dwarfs in open clusters and the initial mass–final mass relationship.

Item Details

Item Type:Refereed Article
Keywords:white dwarfs; open clusters and associations: individual: Praesepe
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81114
Year Published:2004
Web of Science® Times Cited:25
Deposited By:Mathematics and Physics
Deposited On:2012-11-22
Last Modified:2013-06-27

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