Volume 424, Number 1, September II 2004
|Page(s)||347 - 354|
|Section||Atomic, molecular, and nuclear data|
|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
Institut d'Astrophysique de Paris, CNRS, 98 bis boulevard Arago, 75014 Paris, France e-mail: email@example.com
2 Observatoire de Paris-Meudon, LERMA, 92195 Meudon Principal Cedex, France
3 Department of Physics, University of Louisville, Louisville, KY 40292, USA
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.