Identification of the 1400 and 1600 A features observed in the ultraviolet spectra of DA white dwarfs

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-alp...

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Veröffentlicht in:	Astrophys. J., Lett. Ed.; (United States) Lett. Ed.; (United States), 1985-02, Vol.289, p.L31-L33
Hauptverfasser:	Nelan, E. P., Wegner, G.
Format:	Artikel
Sprache:	eng
Schlagworte:	640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources 640302 - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory ABSORPTION SPECTRA Astrophysics ATMOSPHERES ATOMIC AND MOLECULAR PHYSICS CHARGED PARTICLES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DWARF STARS ELEMENTS GRAVITATIONAL FIELDS HYDROGEN HYDROGEN IONS IONS LINE BROADENING LINE WIDTHS LYMAN LINES NONMETALS SPECTRA STARS STELLAR ATMOSPHERES TEMPERATURE DEPENDENCE ULTRAVIOLET SPECTRA WHITE DWARF STARS
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Beschreibung
Zusammenfassung:	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.
ISSN:	0004-637X 1538-4357
DOI:	10.1086/184428