Ultraviolet and visual variability of Theta CrB during a normal B-phase following a shell phase (1980-1985)

Details Ultraviolet and visual variability of Theta CrB during a normal B-phase following a shell phase (1980-1985) Ultraviolet and visual variability of Theta CrB during a normal B-phase following a shell phase (1980-1985)

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158....1d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 1-13. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

17

B Stars, Ultraviolet Astronomy, Variable Stars, Visible Spectrum, Carbon, Far Ultraviolet Radiation, Iron, Line Spectra, Resonance Lines, Spectral Line Width, Stellar Mass Ejection

Scientific paper

Based on far-UV and visual observations made between 1980 and 1985, the phenomena characterizing the end of a shell phase of Theta-CrB, and the normal B-phase following it, are described as part of a long-term study of Be stars. The strength, shape, and velocity of the C IV, Si IV, and Al III resonance lines, and the Fe III lines of low excitation, show associated variability patterns over the whole range of ionization observable in the IUE and visual spectra. The observed variability pattern consists of a one-year narrow-line stage where the lines show narrow absorption cores close to rest wavelength, a two-year series of abrupt changes between a weak and a strong line, and a damping out of these variations leaving the observed spectrum in a lower ionization state. The existence of a phase-lag between similar phenomena occurring in the superionized and subionized/normally ionized regions, is noted.

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