Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phdt........10p&link_type=abstract
Ph.D. Thesis Wisconsin Univ., Madison.
Physics
3
A Stars, Emission Spectra, Flux (Rate), Stellar Atmospheres, Stellar Spectra, Line Spectra, Oao 2, Surface Energy, Ultraviolet Spectroscopy
Scientific paper
In A-type stellar spectra, the cumulative effect of numerous line absorptions is observed to produce strong line blocking in the UV. These line opacities are theoretically expected to have important effects on the structure of the stellar atmosphere and hence the emergent flux at all wavelengths. Line blocked emergent fluxes from line blanketed model atmospheres are found to reproduce the general features of the observed flux distributions within the observational uncertainty for most stars. The UV line absorption features at 10 to 20 A resolution are not generally reproduced in detail however, and the models tend to be much brighter than the stars at wavelengths shorter than 1500 A. Theoretical emergent fluxes from 3600 to 4200 A are presented for 10 models in the range of effective temperature 10000 K to 8000 K and log g = 4.5 to 3.5.
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