Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..864s&link_type=abstract
Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 864-868.
Astronomy and Astrophysics
Astrophysics
3
Early Stars, O Stars, Spectrographs, Stellar Mass Ejection, Stellar Winds, Ultraviolet Spectra, Absorption Spectra, High Resolution, Line Shape, Stellar Spectra
Scientific paper
We report the observation of transient narrow absorption components (NACs) in the stellar wind of the O giant Xi Per. Two sets of GHRS observations of the Si IV ultraviolet resonance doublet have been obtained. These features are extremely weak, with column densities of approximately 10 exp 12/sq cm and optical depths of order 0.1. The features are narrow, less than 30 km/s, and seem to occur in groups. If the NACs are due to the 1393 A component, they represent previously undetected low-velocity discrete absorption components at V(rad) below -600 km/s. If they are high-velocity features on the 1402 A doublet component, they may represent the decay phase of the discrete absorption components at the terminal velocity. In either case, they are a new aspect of the NAC phenomenon that could not have been detected with previous ultraviolet spectrographs.
Altner Bruce
Bolton Charles T.
Cardelli Jason A.
Ebbets Dennis C.
Shore Steven N.
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