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REMARKABLE DEVELOPMENTS IN DELTA CORONAE BOREALIS

J. D. FERNIE
Publications of the Astronomical Society of the Pacific
Vol. 102, No. 653 (July 1990), pp. 783-788
Stable URL: http://www.jstor.org/stable/40679562
Page Count: 6
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REMARKABLE DEVELOPMENTS IN DELTA CORONAE BOREALIS
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Abstract

The chromospherically active star, δ CrB, has been optically variable for several years. It has now been found that the period of this variability increased over four years at the rate of about 10 days/year but that in the fifth year the variability ceased. The average brightness of the star over the same interval has varied by about 4% in what appears to be a roughly five-year cycle. A speculative explanation in terms of active regions and differential rotation is considered.

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