Far-UV variability of theta CrB in 1985-86 : a progression toward higher velocities.
Abstract
New far UV observations of θ CrB obtained with the IUE in 1985 - 1986 are presented. They show that the far UV spectrum of that star has usually continued to exhibit the apparently low excitation state observed from mid-84 to mid-85. However, the C IV resonance lines are occasionally conspicuous and exhibit an even higher outflow velocity than during the preceding epochs of variation, when the C IV resonance lines were strong and frequently present. Such a long term progression toward higher expansion velocities has not yet been observed in any other Be star.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 1987
- Bibcode:
- 1987A&A...173L...8D
- Keywords:
-
- B Stars;
- Far Ultraviolet Radiation;
- Mass Flow Rate;
- Stellar Mass Ejection;
- Stellar Spectrophotometry;
- Variable Stars;
- Iue;
- Resonance Lines;
- Spectrum Analysis;
- Ultraviolet Spectra;
- Astrophysics