Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..263s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 2, Nov. 1983, p. 263-266.
Astronomy and Astrophysics
Astrophysics
42
Balmer Series, H Alpha Line, Spectral Line Width, Stark Effect, Stellar Atmospheres, Fine Structure, Lorentz Force, Solar Atmosphere, Stellar Models
Scientific paper
Stark profiles of the Hα line of hydrogen are computed at densities of astrophysical interest using two different methods: the Model Microfield Method which provides a realistic treatment of the ion dynamics effect and the impact model valid for weak or non overlapping collisions. A good agreement between the two methods is obtained, allowing the generalization of the impact model to other Balmer lines. Neglecting fine structure effects, the profile is shown to be Lorentzian in the line center and an analytical formula for the line width is given. Astrophysical consequences of the validity of the impact treatment are emphasized.
Feautrier N.
Mazure Alain
Nollez Gérard
Stehlé Chantal
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