Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apjs..108..559b&link_type=abstract
Astrophysical Journal Supplement v.108, p.559
Astronomy and Astrophysics
Astronomy
36
Line: Formation, Line: Profiles, Stars: Atmospheres, Stars: White Dwarfs
Scientific paper
New Stark profiles for 21 He I lines and their forbidden components have been calculated for electron densities ranging from 1014 to 6 x 1017 cm-3, and for temperatures ranging from 10,000 K to 40,000 K. The profiles include quasi-static broadening by ions as well as electron broadening---the latter treated within the impact approximation near the core, and within the one-perturber approximation in the far wings. The calculated profiles also allow for line dissolution. These new profiles are the cornerstone of a recent reanalysis of the optical spectrum of a large sample of DB white dwarfs. Our calculations provide a very good match to the observed profiles of all the lines, provided that Stark broadening dominates other broadening mechanisms.
Beauchamp Alain
Bergeron Pierre
Wesemael François
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