Far ultraviolet spectroscopic explorer observations of G226-29: First detection of the H2 quasi-molecular satellite at 1150 Å

N. F. Allard, G. Hébrard, J. Dupuis, P. Chayer, J. W. Kruk, J. Kielkopf, Ivan - Hubeny

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We present new far-ultraviolet observations of the pulsating DA white dwarf G226-29 obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). This ZZ Ceti star is the brightest one of its class and the coolest white dwarf observed by FUSE. We report the first detection of the broad quasi-molecular collision-induced satellite of Lyβ at 1150 Å, an absorption feature that is due to transitions that take place during close collisions of hydrogen atoms. The physical interpretation of this feature is based on recent progress of the line-broadening theory of the far wing of Lyβ. This predicted feature had never been observed before, even in laboratory spectra.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume601
Issue number2 II
StatePublished - Feb 1 2004

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molecular collisions
wings
hydrogen atoms
collision
stars
collisions
hydrogen
detection
laboratory

Keywords

  • Line: profiles
  • Stars: atmospheres
  • Stars: individual (G226-29)
  • Ultraviolet: stars
  • White dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Far ultraviolet spectroscopic explorer observations of G226-29 : First detection of the H2 quasi-molecular satellite at 1150 Å. / Allard, N. F.; Hébrard, G.; Dupuis, J.; Chayer, P.; Kruk, J. W.; Kielkopf, J.; Hubeny, Ivan -.

In: Astrophysical Journal, Vol. 601, No. 2 II, 01.02.2004.

Research output: Contribution to journalArticle

Allard, N. F. ; Hébrard, G. ; Dupuis, J. ; Chayer, P. ; Kruk, J. W. ; Kielkopf, J. ; Hubeny, Ivan -. / Far ultraviolet spectroscopic explorer observations of G226-29 : First detection of the H2 quasi-molecular satellite at 1150 Å. In: Astrophysical Journal. 2004 ; Vol. 601, No. 2 II.
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AU - Allard, N. F.

AU - Hébrard, G.

AU - Dupuis, J.

AU - Chayer, P.

AU - Kruk, J. W.

AU - Kielkopf, J.

AU - Hubeny, Ivan -

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AB - We present new far-ultraviolet observations of the pulsating DA white dwarf G226-29 obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). This ZZ Ceti star is the brightest one of its class and the coolest white dwarf observed by FUSE. We report the first detection of the broad quasi-molecular collision-induced satellite of Lyβ at 1150 Å, an absorption feature that is due to transitions that take place during close collisions of hydrogen atoms. The physical interpretation of this feature is based on recent progress of the line-broadening theory of the far wing of Lyβ. This predicted feature had never been observed before, even in laboratory spectra.

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KW - Stars: individual (G226-29)

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