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

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

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
StatePublished - Nov 2002
Externally publishedYes

Fingerprint

Far UV Spectroscopic Explorer
stellar atmospheres
hydrogen ions
neutral atoms
wings
hydrogen
perturbation
protons
profiles
atoms
plasma
temperature
ion
atmosphere
modeling
calculation
laboratory

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Hébrard, G., Allard, N. F., Hubeny, I. ., Lacour, S., Ferlet, R., & Vidal-Madjar, A. (2002). Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40. Astronomy and Astrophysics, 394(2), 647-651.

Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40. / Hébrard, G.; Allard, N. F.; Hubeny, Ivan -; Lacour, S.; Ferlet, R.; Vidal-Madjar, A.

In: Astronomy and Astrophysics, Vol. 394, No. 2, 11.2002, p. 647-651.

Research output: Contribution to journalArticle

Hébrard, G, Allard, NF, Hubeny, I, Lacour, S, Ferlet, R & Vidal-Madjar, A 2002, 'Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40', Astronomy and Astrophysics, vol. 394, no. 2, pp. 647-651.
Hébrard, G. ; Allard, N. F. ; Hubeny, Ivan - ; Lacour, S. ; Ferlet, R. ; Vidal-Madjar, A. / Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40. In: Astronomy and Astrophysics. 2002 ; Vol. 394, No. 2. pp. 647-651.
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