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Title: Heavy Element Abundance Patterns in Hot White Dwarfs from a Survey of the FUSE Archive
Authors: Barstow, M. A.
Casewell, S. L.
Holberg, J. B.
Barstow, J. K.
First Published: 1-Jan-2013
Presented at: 18th European White Dwarf Workshop, EUROWD12, Pedagog Univ Cracow, Krakow, POLAND
Start Date: 13-Aug-2012
End Date: 17-Aug-2012
Publisher: Astronomical Society of the Pacific
Citation: 18th European White Dwarf Workshop, 2013, 469, pp. 121-126 (6)
Abstract: We present a series of systematic abundance measurements for 89 hot DA white dwarfs drawn from the FUSE observation archive. These stars span the temperature range ≈ 20000-70000K, and form the largest sample to-date, exceeding our earlier study, based mainly on IUE and HST data, by a factor three. Using the heavy element blanketed non-LTE stellar atmosphere calculations from this previous work, we are able to measure the abundances of carbon, silicon, phosphorus and sulphur and examine how they change as the stars cool. We are able to establish the broad range of abundances seen in a given temperature range and establish the incidence of stars which, like HZ43, appear to (surprisingly) be completely devoid of any material other than H in their atmospheres. As a result we can begin to identify stars with peculiar abundances in this temperature range and determine whether or not these objects might be accreting planetary debris, as has been inferred for many cooler objects.
ISBN: 978-1-58381-820-6
Version: Post-print
Status: Peer-reviewed
Type: Conference Paper
Rights: Archived with reference to publisher website.
Appears in Collections:Conference Papers & Presentations, Dept. of Physics and Astronomy

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