R Coronae Borealis in 1992 and 1993

Details R Coronae Borealis in 1992 and 1993 R Coronae Borealis in 1992 and 1993

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106.1138f&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 705, p. 1138-1140

Astronomy and Astrophysics

Astronomy

15

Periodic Variations, Pulse Amplitude, R Coronae Borealis Stars, Stellar Luminosity, Stellar Spectrophotometry, Data Reduction, Image Analysis, Light Curve

Scientific paper

203 nights of UBV automatic photoelectric telescope (APT) data are reported for R Coronae Borealis in the years 1992 and 1993. An additional 21 nights of photometry from this observatory are also presented, 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 peak brightness and showed well-developed pulsations of 0.25 mag amplitude and period 35.3 +/- 0.2 days. To within the observational errors these maintained phase coherence across the two seasons. The deep decline began near the minimum phase of pulsation, whereas in 1985 the deep decline began nearer to the maximum phase of pulsation, casting some doubt on the role of pulsation in triggering deep declines.

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