Journal ArticleDOI
Identification of the 1400 and 1600 A features observed in the ultraviolet spectra of DA white dwarfs
E. P. Nelan,G. Wegner +1 more
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In this article, a resonance broadening of Ly-alpha due to the hydrogen ion quasi molecule has been identified as the cause of the 600 A absorption feature in the spectra of DA white dwarf stars.Abstract:
The 600 A absorption feature in the spectra of cool DA white dwarf stars has been identified as a resonance broadening of Ly-alpha due to the hydrogen quasi molecule. Likewise, the 1400 A absorption feature in the spectra of cool and moderately warm DA white dwarf stars appears to be due to a Ly-alpha satellite line arising from the hydrogen ion quasi molecule. The strength of both features is gravity sensitive and therefore promises to be an excellent indicator of surface gravity.read more
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Journal ArticleDOI
Far-Ultraviolet Spectroscopy of Magnetic Cataclysmic Variables*
S. Araujo-Betancor,Boris T. Gänsicke,Knox S. Long,Klaus Beuermann,D. de Martino,Edward M. Sion,Paula Szkody +6 more
TL;DR: In this paper, the authors used pure hydrogen WD models to fit the FUV spectra of the low-state systems (except RX J1554.2+2721, which is a high-field polar) in order to measure the WD effective temperatures.
Journal ArticleDOI
Profiles of line wings and rainbow satellites associated with optical and radiative collisions
Józef Szudy,William E. Baylis +1 more
TL;DR: The principles and applications of the quasimolecular treatment of optical and radiative collisions are discussed in this paper, where the main attention is focused on the uniform approximation to the unified Franck-Condon (UFC) line shape of near and far-wings and of rainbow satellites associated with pressure-broadened spectral lines.
Journal ArticleDOI
Effective temperatures of cataclysmic variable white dwarfs as a probe of their evolution
Anna F. Pala,Boris T. Gänsicke,Dean M. Townsley,David Boyd,M. J. Cook,D. de Martino,Patrick Godon,J. B. Haislip,A. A. Henden,Ivan Hubeny,K. M. Ivarsen,S. Kafka,Christian Knigge,Aaron P. LaCluyze,Knox S. Long,Tom Marsh,B. Monard,J. P. Moore,G. Myers,Peter Nelson,Daisaku Nogami,Arto Oksanen,Roger D. Pickard,Gary Poyner,Daniel E. Reichart,D. Rodriguez Perez,Matthias R. Schreiber,Jeremy Shears,Edward M. Sion,Rod Stubbings,Paula Szkody,Monica Zorotovic +31 more
TL;DR: In this paper, the Robert Martin Ayers Sciences Fund (RMSF) was used to support the development of the GO-9357 and GO-9724 spacecrafts.
Journal ArticleDOI
An Archive of IUE Low-Dispersion Spectra of the White Dwarf Stars
TL;DR: In this paper, an archive of the ultraviolet low-dispersion spectra for the full set of white dwarf stars observed with the International Ultraviolet Explorer (IUE) satellite over the course of its 18-year mission is presented.
Journal ArticleDOI
Ab initio calculation of electronic transition moments for singlet excited states of the H2 molecule
TL;DR: In this article, Ab initio CI electronic dipole transition moments have been calculated for the transitions between singlet states of the hydrogen molecule correlating asymptotically with H(nl)+H(1s) (n=1,2,3).