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Search for metal pollution in 81 DA White Dwarfs
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Koester, Detlev , Gänsicke, B. T. (Boris T.), Girven, Jonathan and Farihi, Jay (2013) Search for metal pollution in 81 DA White Dwarfs. In: 18th European White Dwarf Workshop (EUROWD12), Cracow, Poland, 13–17 Aug 2012. Published in: Astronomical Society of the Pacific Conference Series, Volume 469 p. 445. ISBN 9781583818206. ISSN 1050-3390.
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Abstract
A total of 82 DA white dwarfs have been observed with the Cosmic Origins Spectrograph on the Hubble Space Telescope in a snapshot program. The targets were selected to be in the Teff range from 17 000 – 25 000 K, where optical metal lines become weak and difficult to detect. Because of the strong Si, C, and O resonance lines in the UV, this survey has a sensitivity that is comparable to that of the Keck/VLT searches for CaII K in cooler white dwarfs. These objects also have no convection zone and thus very short diffusion timescales, assuring that accretion is currently ongoing. The spectra have high resolution and in most cases fairly good S/N. About 60% of them show photospheric metal pollution, predominantly of Si, but in some cases additional metals are present. We report the results of a preliminary analysis and discuss the sources of the accreted matter and the possible rôle of radiative levitation.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Astronomical Society of the Pacific Conference Series | ||||
| Publisher: | Astronomical Society of the Pacific | ||||
| ISBN: | 9781583818206 | ||||
| ISSN: | 1050-3390 | ||||
| Official Date: | 2013 | ||||
| Dates: |
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| Volume: | Volume 469 | ||||
| Page Range: | p. 445 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 18th European White Dwarf Workshop (EUROWD12) | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Cracow, Poland | ||||
| Date(s) of Event: | 13–17 Aug 2012 |
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