| Issue |
A&A
Volume 424, Number 1, September II 2004
|
|
|---|---|---|
| Page(s) | 347 - 354 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361:20040427 | |
| Published online | 17 August 2004 | |
Temperature dependence of the Lyman α line wings in cool hydrogen-rich white dwarf atmospheres. Application to ZZ Ceti white dwarf spectra
1
Institut d'Astrophysique de Paris, CNRS, 98 bis boulevard Arago, 75014 Paris, France e-mail: allard@iap.fr
2
Observatoire de Paris-Meudon, LERMA, 92195 Meudon Principal Cedex, France
3
Department of Physics, University of Louisville, Louisville, KY 40292, USA
Received:
11
March
2004
Accepted:
29
April
2004
Theoretical Lyman α absorption profiles
show a significant dependence on temperature
of the H2 satellite at 1600 Å, whereas the H
satellite at
1400 Åremains unchanged.
The use of opacities calculated with different approximations concerning
the electric dipole transition moment
(constant, dependent on interatomic distance, and
modulated by the Boltzmann factor)
lead to very different synthetic absorption spectra.
Our new Lyman α profiles over the
ZZ Ceti range of temperatures have been used to synthesize theoretical
spectra which compare very well to existing HST spectra.
Key words: line: profiles / stars: atmospheres / stars: white dwarfs / ultraviolet: stars
© ESO, 2004
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