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2008IBVS.5832....1I - IAU Inform. Bull. Var. Stars, 5832, 1 (2008/May-0)
Recent CCD photometry of AB Dor, and a comment on the long-term activity cycle.
INNIS J.L., BUDDING E., OLAH K., JARVINEN S.P., COATES D.W., MESSINA S. and KAYE T.G.
Abstract (from CDS):
B and V photometry of AB Doradus, obtained in 2007 March-April, revealed a spot-wave near 0.08 mag in V, and of comparable size in B. The phase of spot minimum was well described by the standard ephemeris. Further photometry from 2007 December-2008 March indicated a slightly greater amplitude with minimum light now about 0.1 of a rotation cycle earlier in phase. The overall brightness of the star at these two epochs was amongst the lowest ever observed and was consistent with AB Dor's previously suggested 20-year activity cycle. A long-term B-V variation is also seen.
Abstract Copyright: ∼
Journal keyword(s): Photometry, spots
Simbad objects: 1
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