Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..779m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Oct. 1, 1987, p. 779-796.
Astronomy and Astrophysics
Astronomy
24
Dwarf Novae, Emission Spectra, Stellar Models, Stellar Spectra, Thermodynamic Equilibrium, Accretion Disks, Balmer Series, Brightness Temperature, Line Spectra, Spectral Line Width, Stark Effect
Scientific paper
The Balmer line profiles of Z Cha are compared with local thermodynamic equilibrium (LTE) models of the disk. Even with the inclusion of Stark broadening, the theoretical line profiles are too narrow in comparison to the observations. Stark broadening has little effect on the LTE models because the disk becomes opaque in the inner regions where Stark broadening would have the greatest effect. The effects of the velocity shear in the disk are important at all radii in the disk. The LTE approximation can only be retained if the disk has a more complex vertical structure than assumed in the models. Optically thin disks produce more optical flux in their outer parts than do opaque disks of the same effective temperature. Despite this, the models cannot fit the observed eclipse depth of Z Cha in quiescence which is unusually shallow. It is concluded that the outer disk is not less than 3 times brighter than expected relative to the inner disk.
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