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

Journal Article · Fri Feb 15 04:00:00 EST 1985 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/184428· OSTI ID:5951742

Nelan, E P; Wegner, G

The lambda1600 absorption feature in the spectra of cool DA white dwarf stars has been identified as a resonance broadening of Ly..cap alpha.. due to the hydrogen quasi molecule. Likewise, the lambda1400 absorption feature in the spectra of cool and moderately warm DA white dwarf stars appears to be due to a Ly..cap 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.

• Research Organization: Department of Physics and Astronomy, Dartmouth College
• OSTI ID: 5951742
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 289:2; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ATMOSPHERES
CHARGED PARTICLES
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