Far-wing profiles of the Lyman alpha line of H perturbed by H: quantum calculations

Details Far-wing profiles of the Lyman alpha line of H perturbed by H: quantum calculations Far-wing profiles of the Lyman alpha line of H perturbed by H: quantum calculations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..501l&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

Scientific paper

In the so-called one-perturber approach, free-bound and free-free transitions contribute to absorption in the wings of atomic lines perturbed by collisions. In this poster, we present new calculations for the conditions prevailing in stellar atmospheres. Application to the calculation of the Lyman alpha quasi-molecular satellite due to H-H collisions is presented. The initial and final wave functions of the binary complex are quite general, taking into account non-adiabatic effects between the adiabatic electronic states. We compare the results that include the rotational coupling between the upper B1Sigmau+ and C1Piu states with the results obtained in an adiabatic approach. It is shown that no significant difference between these results is obtained so that the total absorption coefficient may be calculated by summing up the contributions of the different electronic transitions calculated in the Born-Oppenheimer approximation. As expected, discrepancies between quantal and semi-classical results appear at low temperatures, which are reduced as the temperature increases.

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