Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..515t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 2, p. 515-529
Astronomy and Astrophysics
Astrophysics
39
B Stars, Emission Spectra, H Beta Line, Periodic Variations, Stellar Winds, Ultraviolet Absorption, Ultraviolet Spectra, Carbon, Iue, Nickel, Silicon, Stellar Envelopes, Stellar Models
Scientific paper
We present a quantitative study of the variability in ultraviolet resonance lines of N V, Si IV and C IV of the Be star gamma Cas. For this purpose we used IUE spectra obtained over a period of eleven years. Variability occurs in the form of discrete absorption components (DACs), which are formed in the fast-outflowing radiatively driven part of the stellar wind. We constructed a template spectrum from spectra containing no or minor extra absorption due to DACs and modeled the isolated DACs in the obtained quotient spectra. Besides the frequently observed narrow components (Vt typically less than or = 250 km/s) at high velocity, we found several broad components occurring at low and intermediate wind velocities.
Kaper Lex
Telting John H.
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