2003/12/18 by N. F. Allard, G. H�brard, G. Hébrard +7 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/382153
published as Astrophys.J. 601 (2004) L183-L186 · Accepted for publication in ApJ Letters; 6 pages, 3 figures
arxiv created 2003/12/18 · openalex publication_date 2004/01/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
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.