Recent CCD Photometry of AB Dor, and a Comment on the Long-term Activity Cycle

Details Recent CCD Photometry of AB Dor, and a Comment on the Long-term Activity Cycle Recent CCD Photometry of AB Dor, and a Comment on the Long-term Activity Cycle

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ibvs.5832....1i&link_type=abstract

Information Bulletin on Variable Stars, 5832, 1.

Computer Science

4

Photometry, Spots

Scientific paper

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.

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