Quasi-molecular lines in Lyman wings of cool DA white dwarfs: Application to FUSE observations of G231-40
Abstract
Comprehensive, calculations of the Lyman-alpha and Lyman-beta line wings which include perturbations by both neutral hydrogen and protons and all possible quasi-molecular states of H2 and H2+ are used to predict synthetic spectra for cool DA white dwarfs. They are compared with FUSE observation of G231-40. The appearance of the line wings between Lyman-alpha and Lyman-beta 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 plamas.
- Publication:
-
SF2A-2002: Semaine de l'Astrophysique Francaise
- Pub Date:
- June 2002
- Bibcode:
- 2002sf2a.conf..527H