R Coronae Borealis and Delta Coronae Borealis in 1990
Abstract
UBV photometry of R CrB and Delta CrB has been obtained through the APT Service on 71 nights in 1990. R CrB proved to be near-maximum-light during this time and showed its usual single period of 44.6 +/-0.6 days. Delta CrB, a chromospherically active star that was essentially constant in 1989, showed renewed variability in 1990 with an amplitude of about 0.04 mag in V and a period of 60.8 +/-1.7 days, similar to its behavior two years earlier.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- October 1991
- DOI:
- 10.1086/132930
- Bibcode:
- 1991PASP..103.1091F
- Keywords:
-
- R Coronae Borealis Stars;
- Stellar Spectrophotometry;
- Chromosphere;
- Fourier Transformation;
- Light Curve;
- Stellar Activity;
- Ubv Spectra;
- Astrophysics;
- STARS: VARIABLES;
- PHOTOMETRY