Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441l..85b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 441, no. 2, p. L85-L88
Astronomy and Astrophysics
Astrophysics
11
Helium, Stellar Atmospheres, Stellar Models, Stellar Spectrophotometry, White Dwarf Stars, Forbidden Transitions, Nuclear Reactions, Spectrum Analysis
Scientific paper
Red optical spectrophotometry of three DB white dwarfs confirms the existence, first reported by Greenstein and Liebert, of new forbidden components of He I transitions near 6068 and 6632 A in the spectra of these stars. However, our search for the additional components tentatively reported earlier near 5379, 6337, and 6485 A remained unsuccessful. New model atmosphere calculations are presented which strengthen the identification of the confirmed features as, respectively, the forbidden 23P - 33P and 21P - 31P transitions in the He I ion, which arise from Stark perturbations of the upper atomic levels. Our calculations show, furthermore, that these features, which should be generally present in the red spectra of hot DB stars, are predicted with a strength comparable to that observed.
Beauchamp Alain
Bergeron Pierre
Liebert James
Wesemael François
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