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High-resolution optical spectroscopy of Praesepe white dwarfs


Casewell, SL and Dobbie, PD and Napiwotzki, R and Burleigh, MR and Barstow, MA and Jameson, RF, High-resolution optical spectroscopy of Praesepe white dwarfs, Monthly Notices of the Royal Astronomical Society, 395, (4) pp. 1795-1804. ISSN 0035-8711 (2009) [Refereed Article]

Copyright Statement

Copyright 2009 The Authors. Journal compilation RAS.

DOI: doi:10.1111/j.1365-2966.2009.14593.x


We present the results of a high-resolution optical spectroscopic study of nine white dwarf candidate members of Praesepe undertaken with the VLT and Ultraviolet and Visual Echelle Spectrograph. We find, contrary to a number of previous studies, that WD0836+201 (LB390, EG59) and WD0837+199 (LB393, EG61) are magnetic and non-magnetic white dwarfs, respectively. Subsequently, we determine the radial velocities for the eight non-magnetic degenerates and provide compelling evidence that WD0837+185 is a radial velocity variable and possibly a double-degenerate system. We also find that our result for WD0837+218, in conjunction with its projected spatial location and position in initial mass–final mass space, argues it is more likely to be a field star than a cluster member. After eliminating these two white dwarfs, and WD0836+199 which has no clean Sloan Digital Sky Survey photometry, we use the remaining five stars to substantiate modern theoretical mass–radius relations for white dwarfs. In light of our new results, we re-examine the white dwarf members of Praesepe and use them to further constrain the initial mass–final mass relation (IFMR). We find a near-monotonic IFMR, which can still be adequately represented by simple linear function with only one outlier which may have formed from a blue straggler star.

Item Details

Item Type:Refereed Article
Keywords:white dwarfs; open clusters and associations: general
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:81022
Year Published:2009
Web of Science® Times Cited:61
Deposited By:Mathematics and Physics
Deposited On:2012-11-21
Last Modified:2013-06-26

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