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Astron. Astrophys. 355, L5-L8 (2000)


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Letter to the Editor

Self broadening of hydrogen lines: initial results

P.S. Barklem 1, N. Piskunov 1 and B.J. O'Mara 2

1 Uppsala Astronomical Observatory, Box 515, 751-20 Uppsala, Sweden
2 The University of Queensland, Department of Physics, St Lucia, 4072, Australia

Received 14 December 1999 / Accepted 31 January 2000

Abstract

For the first time broadening by both resonance and dispersive-inductive interactions with H-atoms are included in the formation of Balmer lines in cool stars, without the use of a multipole expansion. Comparison of synthetic profiles with observed profiles for the Sun and two late F dwarfs shows that this improvement in broadening theory accounts for some of the problems found in previous work. It is anticipated that planned future developments in the theory of self broadening will lead to further improve ments in the modelling of cool star atmospheres.

Key words: atomic processes – line: profiles

Send offprint requests to: P.S. Barklem

© European Southern Observatory (ESO) 2000

Online publication: March 17, 2000

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