Statistics – Computation
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367..253b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 253-269. Research supported by NSERC and Ministere d
Statistics
Computation
72
Cool Stars, Stellar Atmospheres, Stellar Spectra, White Dwarf Stars, Balmer Series, Computational Grids, Energy Transfer, Thermodynamic Equilibrium
Scientific paper
A new generation of model atmospheres and synthetic appropriate to the study of cool DA white dwarfs is presented. The thermodynamic structure of the model atmospheres is calculated in LTE, with a standard complete linearization technique modified to take into account the energy transport by convection. The emergent fluxes are calculated, providing an improved theoretical framework for the computation of detailed atomic level populations which permits a careful analysis of the gravity- and helium-sensitive high Balmer lines. A comparison with results based on older, less satisfactory, formalisms reveals that this improved treatment leads to significant differences not only in the predicted line profiles, but also in the absolute continuum flux. These new synthetic spectra are used to study some of the systematic properties of the atmospheres of cool DA white dwarfs.
Bergeron Pierre
Fontaine Gérard
Wesemael François
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