SIMBAD references

2004A&A...424..347A - Astronomy and Astrophysics, volume 424, 347-354 (2004/9-2)

Temperature dependence of the Lyman α line wings in cool hydrogen-rich white dwarf atmospheres. Application to ZZ Ceti white dwarf spectra.

ALLARD N.F., KIELKOPF J.F. and LOEILLET B.

Abstract (from CDS):

Theoretical Lyman α absorption profiles show a significant dependence on temperature of the H2 satellite at 1600Å, whereas the H2+ satellite at 1400Å 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.

Abstract Copyright:

Journal keyword(s): line: profiles - stars: atmospheres - stars: white dwarfs - ultraviolet: stars

Simbad objects: 4

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2020.10.22-05:58:57

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