The peculiar variable CH Cygni in 1981
Abstract
Spectroscopy and photometry of the peculiar variable star CH Cyg carried out during 1981 are reported. At maximum light the star was approximately 0.5 m brighter than at any time in the past 20 years. The Balmer lines exhibited one absorption and two emission components. Beginning in June a Ti II 'shell' spectrum developed at a wavelength less than 4800 A. The gM6 spectrum was blanketed by a hot continuum which in the ultraviolet was approximately 20 times as intense. Rapid light fluctuations of amplitude less than or approximately equal to 0.25 m U were detected; their characteristic time was approximately 10 min. The unusual brightening and the observed behavior of the line profiles probably result from the accretion process entering a supercritical regime.
- Publication:
-
Soviet Astronomy Letters
- Pub Date:
- August 1982
- Bibcode:
- 1982SvAL....8..257L
- Keywords:
-
- Peculiar Stars;
- Spectral Line Width;
- Stellar Spectra;
- Variable Stars;
- Balmer Series;
- Light Curve;
- Line Spectra;
- Radial Velocity;
- Stellar Mass Accretion;
- Stellar Spectrophotometry;
- Ultraviolet Spectroscopy;
- Astrophysics;
- PECULIAR STARS;
- SPECTRAL LINE WIDTH;
- STELLAR SPECTRA;
- VARIABLE STARS;
- BALMER SERIES;
- LIGHT CURVE;
- LINE SPECTRA;
- RADIAL VELOCITY;
- STELLAR MASS ACCRETION;
- STELLAR SPECTROPHOTOMETRY;
- ULTRAVIOLET SPECTROSCOPY