Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...506..993a&link_type=abstract
Astronomy and Astrophysics, Volume 506, Issue 2, 2009, pp.993-997
Astronomy and Astrophysics
Astrophysics
3
Line: Profiles, Stars: White Dwarfs
Scientific paper
Context: Quasi-molecular line satellites in the red wings of Lyman series of atomic hydrogen have been identified in the spectra of hydrogen-rich white dwarfs. These features are produced by radiative collisions. Aims: Structures observed about 995 Åin the Lyman-γ wing of hot white dwarfs have been shown to be caused by quasi-molecular absorption of H2+ molecules. Methods: Improvements to previous theoretical calculations of the Lyman-γ line profiles can be achieved by using a unified theory that takes into account the dependence of the dipole moments on internuclear distance during the collision. Results: For the first time, we have computed the transition dipole moments. We measure a significant increase in the region of the formation of the satellites, which alters the general shape of the profile. Conclusions: A large increase in the strength of the two main satellites at 992 and 996 Å leads to a deeper broad absorption in the synthetic spectra, which should improve the comparison with observation as previous predicted Lyman-γ satellites were too weak.
Allard Nicole F.
Kruk Jeff W.
Noselidze Irakli
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