Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...424..347a&link_type=abstract
Astronomy and Astrophysics, v.424, p.347-354 (2004)
Astronomy and Astrophysics
Astrophysics
12
Line: Profiles, Stars: Atmospheres, Stars: White Dwarfs, Ultraviolet: Stars
Scientific paper
Theoretical Lyman α absorption profiles show a significant dependence on temperature of the H2 satellite at 1600 Å, whereas the H2+ satellite at 1400 Å remains 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.
Allard Nicole F.
Kielkopf John F.
Loeillet Benoît
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