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- Title
RESONANCE BROADENING AND VAN DER WAALS BROADENING.
- Authors
Mashonkina, L.
- Abstract
Resonance broadening is important for the hydrogen lines in the spectra of F-type and later stars. In the corresponding temperature regime, the extended wings of the Balmer lines are used as a stellar effective temperature indicator. We show the effect of the use of two broadening theories, Ali & Griem (1965, 1966) and Barklem et al. (2000a, 2000b), on the effective temperature derived in non-LTE from Hα and Hβ in the Sun and the metal-poor star HD19445. Van der Waals broadening is important for strong spectral lines in the atmospheres of F-type and later stars. For the selected transitions in Ca I and Ca II, line profile comparisons are made between applying the van der Waals damping constants from laboratory measurements, the ABO perturbation theory, and the classic Uns¨old approximation.
- Subjects
RESONANCE broadening; VAN der Waals forces; HYDROGEN spectral lines; F stars; BALMER line; TEMPERATURE of stars
- Publication
EAS Publications Series, 2010, Vol 43, p135
- ISSN
1633-4760
- Publication type
Article
- DOI
10.1051/eas/1043009