R-CORONAE-BOREALIS IN 1992 AND 1993

Citation
Jd. Fernie et S. Seager, R-CORONAE-BOREALIS IN 1992 AND 1993, Publications of the Astronomical Society of the Pacific, 106(705), 1994, pp. 1138-1140
Citations number
8
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
ISSN journal
00046280 → ACNP
Volume
106
Issue
705
Year of publication
1994
Pages
1138 - 1140
Database
ISI
SICI code
0004-6280(1994)106:705<1138:RI1A1>2.0.ZU;2-I
Abstract
203 nights of UBV APT data are reported for R Coronae Borealis in the years 1992 and 1993. An additional 21 nights of photometry from this o bservatory are also reported, and previously reported visual estimates are included to sketch the early stages of a deep decline at the end of the 1993 season. Through most of these two seasons R CrB reached pe ak brightness and showed well-developed pulsations of 0.25 mag amplitu de and period 35.3 +/- 0.2 days. To within the observational errors th ese maintained phase coherence across the two seasons. The deep declin e began near the minimum phase of pulsation, whereas in 1985 the deep decline began nearer to the maximum phase of pulsation, casting some d oubt on the role of pulsation in triggering deep declines.