The 1988 decline of R Coronae Borealis

Details The 1988 decline of R Coronae Borealis The 1988 decline of R Coronae Borealis

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..149c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 1, 1990, p. 149-167.

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55

R Coronae Borealis Stars, Spectrum Analysis, Stellar Spectrophotometry, Absorption Spectra, Emission Spectra, Photosphere, Stellar Color, Stellar Magnitude

Scientific paper

Photoelectric and both high and low resolution spectroscopic observations of the 1988 decline of R Coronae Borealis have been obtained and analyzed. The photometric data are used to compare the color curves of the present decline with those of previous declines of R Coronae Borealis and also with declines of other R Coronae Borealis stars. Two extreme types of color decline, termed here 'blue' and 'red', are identified. The blue type shows a blueward trend in the (U-B) and (B-V) colors after the star begins to decline in V. The cause of this trend is increased flux in the U, B, and V filter bands relative to the R and I bands. The red type declines show all colors reddening as soon as the V mag declines. It is suggested that the red declines will have no broadband emission in their spectra.

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