The explanation of the 1400 and 1600 A features in DA white dwarfs

Astronomy and Astrophysics – Astronomy

Scientific paper

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58

Absorption Spectra, Iue, Stellar Spectra, Ultraviolet Astronomy, White Dwarf Stars, Hydrogen Ions, Molecular Absorption, Molecular Ions

Scientific paper

The authors present new IUE observations of 4 cool DA white dwarfs together with additional data for 8 objects from the literature. All objects show absorption features near 1400 and/or 1600 Å, which were already noted by other authors. These features are explained as due to quasi-molecular absorption of the H2 (1600 Å) resp. H2+ (1400 Å) molecules.

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