Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..267b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 15, 1990, p. 267-270. Research supported by S
Astronomy and Astrophysics
Astronomy
20
Absorption Spectra, B Stars, Interstellar Gas, Stellar Composition, Ultraviolet Spectra, Abundance, Electron Density (Concentration), Fine Structure, Iue, Red Shift
Scientific paper
A comparison of IUE ultraviolet spectra of the star 4 Lac with observations of a suitable comparison star have confirmed the presence of 'high-velocity gas components' in the former which are redshifted by a velocity about 100 km/s from the low-velocity interstellar gas. In addition to providing an unambiguous identification of the species which show high-velocity components, the new data yield improved values for equivalent widths. The derived column densities, element depletions and ionization balances all lie within the range of values obtained from the UV spectroscopy of old supernova remnants. Firmer predictions of the gas electron and hydrogen densities may be possible from observations of fine structure levels in species such as C II and Si II although, as is shown, these will require substantial IUE exposure times even for the brighter stars.
Bates Brandon
Catney M. G.
Keenan Francis P.
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