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Understanding the Spectrum of the Very Hot DA White Dwarf PG 0948+534

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posted on 2018-01-09, 10:06 authored by S. P. Preval, M. A. Barstow
PG 0948+534 is currently one of the hottest DA white dwarf stars, and is also one of the most mysterious. Attempts to model the sharp, deep absorption features of this star have been unsuccessful. In these proceedings we describe our analysis of PG 0948+534. We perform a line survey of the UV spectrum of PG 0948+534, making detections of 300+ absorption features, and identifying four distinct velocity regimes. We find evidence of circumstellar absorption in the profiles of C IV and Si IV. Using non-local thermodynamic equilibrium model atmospheres, we are able to correctly model the absorption features of the star, providing abundance measurements for C, N, O, and Si for PG 0948+534 for the first time. We also revise the effective temperature and gravity for this star using models including these new abundances.

History

Citation

Astronomical Society of the Pacific Conference Series, 2017, 509, pp. 195-195

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Source

20th European Workshop on White Dwarfs (EuroWD16)

Version

  • AM (Accepted Manuscript)

Published in

Astronomical Society of the Pacific Conference Series

Publisher

Astronomical Society of the Pacific

issn

1050-3390

Copyright date

2017

Available date

2018-01-09

Publisher version

http://www.aspbooks.org/a/volumes/article_details/?paper_id=38084

Temporal coverage: start date

2016-07-25

Temporal coverage: end date

2016-07-29

Language

en

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