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

doi:10.1051/0004-6361:20021141

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 journal › Article › peer-review

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 language	English (US)
Pages (from-to)	647-651
Number of pages	5
Journal	Astronomy and astrophysics
Volume	394
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20021141
State	Published - Nov 2002
Externally published	Yes

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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10.1051/0004-6361:20021141

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

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.",

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year = "2002",

month = nov,

doi = "10.1051/0004-6361:20021141",

language = "English (US)",

volume = "394",

pages = "647--651",

journal = "Astronomy and astrophysics",

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TY - JOUR

T1 - Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40

AU - Hébrard, G.

AU - Allard, N. F.

AU - Hubeny, I.

AU - Lacour, S.

AU - Ferlet, R.

AU - Vidal-Madjar, A.

PY - 2002/11

Y1 - 2002/11

N2 - 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.

AB - 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.

KW - Line: profiles

KW - Radiation mechanisms: general

KW - Stars: atmospheres

KW - Stars: individual: G231-40

KW - Ultraviolet: stars

KW - White dwarfs

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DO - 10.1051/0004-6361:20021141

M3 - Article

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SN - 0004-6361

VL - 394

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JO - Astronomy and astrophysics

JF - Astronomy and astrophysics

IS - 2

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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