Godon, Patrick, Sion, Edward M., Gänsicke, B. T. (Boris T.) and De Martino, Domitilla. (2011) A far-ultraviolet spectroscopic analysis of BZ Ursae Majoris. Publications of the Astronomical Society of the Pacific, Vol.123 (No.907). pp. 1071-1075. ISSN 0004-6280

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Abstract

We present an analysis of the Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) far-ultraviolet snapshot spectrum of the dwarf nova BZ UMa taken during quiescence. We find that the flux continuum is consistent with that of a white dwarf atmosphere with a temperature of 15,000 K, a projected rotational velocity of 200 km/s, nonsolar abundances with enhanced N/C ratio, and a distance of ≈156 pc when assuming a white dwarf gravity of log g=7.5. We also show that the hydrogen quasi-molecular satellite lines opacity affects the spectrum around ≈1300-1400 Å λ and has to be included to fine-tune the spectral modeling, this is self-consistent with the low stellar temperature we find.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Vacuum ultraviolet spectroscopy, Dwarf novae -- Spectra, Cataclysmic variable stars
Journal or Publication Title:	Publications of the Astronomical Society of the Pacific
Publisher:	University of Chicago Press
ISSN:	0004-6280
Date:	September 2011
Volume:	Vol.123
Number:	No.907
Page Range:	pp. 1071-1075
Identification Number:	10.1086/661763
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	National Science Foundation (U.S.) (NSF)
Grant number:	AST0807892 (NSF)
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URI:	http://wrap.warwick.ac.uk/id/eprint/40191

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