Computer Science
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..283c&link_type=abstract
In ESA 3rd European IUE Conf. p 283-285 (SEE N83-11889 02-88)
Computer Science
Carbon, Line Spectra, Nitrogen, O Stars, Resonance Lines, Silicon, Variability, Far Ultraviolet Radiation, Ionization Potentials, Photosphere, Stellar Atmospheres, Stellar Structure, Ultraviolet Absorption
Scientific paper
Five 0 type stars were monitored with the IUE high resolution instrument in order to detect profile variability of a selected sample of lines which are sensitive indicators of outer atmospheric structures. Results confirm variability in UV profiles. Star Lambda Ori A has a high velocity secondary absorption component of the profiles which changes in strength, but not in velocity. The interpretation of this component and of the associated variability suggests the presence of a postcoronal, spherically symmetric, constant velocity, shell-like zone with a mean relative ionic column density related linearly to the absorption equivalent widths. Variations in columnar densities are seen as changes in the equivalent width of displaced absorption. Radial thickness of the shell can be estimated from its distance from the photosphere and from the ionization equilibria of the measured atomic species.
Costero R. G.
Franco Lucia M.
Kontizas Evangelista
Kontizas Mary
Stalio Roberto
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