Resonance broadening and van der waals broadening

Details Resonance broadening and van der waals broadening Resonance broadening and van der waals broadening

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010eas....43..135m&link_type=abstract

EAS Publications Series, Volume 43, 2010, Non-LTE Line Formation for Trace Elements in Stellar Atmospheres, Edited by R. Monier,

Computer Science

3

Scientific paper

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 Unsöld approximation.

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