Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...471..671m&link_type=abstract
Astronomy and Astrophysics, Volume 471, Issue 2, August IV 2007, pp.671-673
Astronomy and Astrophysics
Astrophysics
3
Atomic Processes, Molecular Processes, Stars: Atmosphere, Line: Formation, Stars: Chromospheres, Stars: Late-Type
Scientific paper
Aims:We study the influence of chemi-ionization in H*(n) + H(1s) collisions and inverse chemi-recombination processes on the population of higher levels and consequently on profiles of hydrogen lines in the atmospheres of late type (M) stars. Methods: Modeling, using general stellar atmosphere code PHOENIX to reveal the importance of the inclusion of such processes. Results: We demonstrate for the first time observationally detectable effects of these chemi-processes on stellar spectra. Conclusions: It is very important to include chemi-ionization and chemi-recombination processes in modeling of atmospheres of late type stars, especially if one wants to use line profiles for diagnostics of stellar photospheres and lower chromospheres.
Alard F.
Dimitrijevic Milan S.
Hauschildt Paul
Ignjatović Lj M.
Jevremovic Darko
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