Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss..99..139d&link_type=abstract
(International Astronomical Union, Colloquium on Double Stars, Physical Properties and Generic Relations, 80th, Bandung, Indones
Astronomy and Astrophysics
Astrophysics
2
Line Spectra, Radial Velocity, Shell Stars, Spectral Energy Distribution, Stellar Envelopes, Ultraviolet Spectra, Abundance, Ionization, Iue, Resonance Lines, Spectrum Analysis, Visible Spectrum
Scientific paper
The radial velocity and profile variations of UV lines of the shell star Zeta Tau have been examined in the IUE spectra obtained in 1978-1982. The neutral atoms, and once or twice-ionized ions (except C II, Al III, Si III resonance lines) follow the same velocity variations as in the visual spectra, while the Si IV and C IV resonance lines show a constant negative velocity (approximately 50 km/s at the core). The Al III, C II resonance lines and probably Fe III (mult. No. 34) are formed in both regions, i.e., in lowly-ionized and highly-ionized regions and the Si III resonance line is formed in a highly-ionized region.
Dawanas D. N.
Hirata Ryuko
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