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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2012

Inelastic Mg plus H collision data for non-LTE applications in stellar atmospheres

Résumé

Rate coefficients for inelastic Mg+H collisions are calculated for all transitions between the lowest seven levels and the ionic state (charge transfer), namely Mg(3s(2) S-1, 3s3p P-3, 3s3p P-1, 3s4s S-3, 3s4s S-1, 3s3d D-1, 3s4p P-3)+H(1s) and Mg+(3s S-2)+H-. The rate coefficients are based on cross-sections from full quantum scattering calculations, which are themselves based on detailed quantum chemical calculations for the MgH molecule. The data are needed for non-LTE applications in cool astrophysical environments, especially cool stellar atmospheres, and are presented for a temperature range of 500-8000 K. From consideration of the sensitivity of the cross-sections to various uncertainties in the calculations, most importantly input quantum chemical data and the numerical accuracy of the scattering calculations, a measure of the possible uncertainties in the rate coefficients is estimated.

Dates et versions

hal-00725907 , version 1 (28-08-2012)

Identifiants

Citer

P. S. Barklem, A. K. Belyaev, Marie Guitou, A. Spielfiedel, N. Feautrier. Inelastic Mg plus H collision data for non-LTE applications in stellar atmospheres. Astronomy and Astrophysics - A&A, 2012, 541, pp.A80. ⟨10.1051/0004-6361/201219081⟩. ⟨hal-00725907⟩
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