FUSE observations of G226-29: First detection of the H_2 quasi-molecular satellite at 1150A

Abstract

We present new FUV 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 Ly-beta at 1150 A, an absorption feature that is due to transitions which 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 Ly-beta. This predicted feature had never been observed before, even in laboratory spectra.

arXiv commentAccepted for publication in ApJ Letters; 6 pages, 3 figures

References in corpus (12)

• Overview of the Far Ultraviolet Spectroscopic Explorer Mission
• On-Orbit Performance of the Far Ultraviolet Spectroscopic Explorer (FUSE) Satellite
• Mode identification of Pulsating White Dwarfs using the HST
• A comparison of DA white dwarf temperatures and gravities from FUSE Lyman line and ground-based Balmer line observations
• Ab initio calculations with a nonspherical Gaussian basis set: Excited states of the hydrogen molecule
• Deuterium Toward WD1634-573: Results from the Far Ultraviolet Spectroscopic Explorer (FUSE) Mission
• FUSE observations of hot white dwarfs
• Quasi-molecular Satellites of Lyman Beta in the Spectrum of the DA White Dwarf WOLF 1346
• FUSE Observation of the Ultramassive White Dwarf PG1658+441
• A collision-induced satellite in the Lyman Beta profile due to H-H collisions
• Modeling of the Lyman gamma satellites in FUSE spectra of DA white dwarfs
• Quasi-molecular lines in Lyman wings of cool DA white dwarfs; Application to FUSE observations of G231-40

Cited by in corpus (9)

• New Praesepe white dwarfs and the initial mass-final mass relation
• High resolution optical spectroscopy of Praesepe white dwarfs
• A new detailed examination of white dwarfs in NGC3532 and NGC2287
• Praesepe and the seven white dwarfs
• Further investigation of white dwarfs in the open clusters NGC2287 and NGC3532
• A Far Ultraviolet Archival Study of Cataclysmic Variables: I. FUSE and HST/STIS Spectra of the Exposed White Dwarf in Dwarf Nova Systems
• Lyman-alpha wing absorption in cool white dwarf stars
• A massive white dwarf member of the Coma Berenices Open Cluster
• Collisional effects in the blue wing of Lyman-alpha