Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40

G. Hébrard, N. F. Allard, I. Hubeny, S. Lacour, R. Ferlet, A. Vidal-Madjar

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

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 H2+. They are used to improve theoretical modeling of synthetic spectra for cool DA white dwarfs. We compare them with FUSE observation of G231-40. The appearance of the line wings between Lyman α and Lyman β is shown to be sensitive to the abundance of hydrogen ions and neutral atoms, and thereby to provide a temperature diagnostic for stellar atmospheres and laboratory plasmas.

Original languageEnglish (US)
Pages (from-to)647-651
Number of pages5
JournalAstronomy and astrophysics
Volume394
Issue number2
DOIs
StatePublished - Nov 2002

Keywords

  • Line: profiles
  • Radiation mechanisms: general
  • Stars: atmospheres
  • Stars: individual: G231-40
  • Ultraviolet: stars
  • White dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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