Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf..283s&link_type=abstract
SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,
Astronomy and Astrophysics
Astrophysics
Atomic Data, Line: Formation, Stars: Abundances
Scientific paper
Non-LTE modelisation of stellar atmospheres requires an accurate knowledge of collisional rate coefficients (mainly with H atoms) that compete with radiative rates to populate the atomic levels. In the framework of the SAM-GAIA project, we carry out, with colleagues from Uppsala, St. Petersburg and Nice, an interdisciplinary work combining quantum chemistry, collision physics and astrophysical modeling. Present studies concern collisional excitation of Mg and O by H-atoms. In the particular case of Mg, 15 electronic states of the MgH molecule as well as the associated couplings that mix the states during the collision were calculated. The resulting cross sections and rate coefficients point out the sensitivity of the results with the quantum chemistry data. Our detailed calculations show that the usual approximate formulae (Drawin, Kaulakys) lead to errors by factors up to 10^6. Consequences on atmospheric parameters are analyzed.
Belyaev Andrey K.
Feautrier N.
Guitou M.
Spielfiedel A.
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