Volume 394, Number 2, November I 2002
|Page(s)||647 - 651|
|Section||Stellar structure and evolution|
|Published online||15 October 2002|
Quasi-molecular lines in Lyman wings of cool DA white dwarfs
Application to observations of G 231–40
Institut d'Astrophysique de Paris, CNRS, 98 boulevard Arago, 75014 Paris, France
2 Observatoire de Paris-Meudon, LERMA, 92195 Meudon Principal Cedex, France
3 NOAO, 950 North Cherry Avenue, Tucson, AZ 85726, USA
4 Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
Corresponding author: G. Hébrard, firstname.lastname@example.org
Accepted: 5 August 2002
We present new theoretical calculations of the total line profiles of Lyman α and Lyman β which include perturbations by both neutral hydrogen and protons and all possible quasi-molecular states of H2 and H. They are used to improve theoretical modeling of synthetic spectra for cool DA white dwarfs. We compare them with FUSEobservation of G 231–40. The appearance of the line wings between Lyman α and Lyman β is shown to be sensitive to the relative abundance of hydrogen ions and neutral atoms, and thereby to provide a temperature diagnostic for stellar atmospheres and laboratory plasmas.
Key words: line: profiles / radiation mechanisms: general / stars: atmospheres / stars: individual: G231-40 / white dwarfs / ultraviolet: stars
© ESO, 2002
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