The Evolution of Surface Structures on Ab-Doradus

Details The Evolution of Surface Structures on Ab-Doradus The Evolution of Surface Structures on Ab-Doradus

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277.1145u&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 277, NO. 3/DEC1, P.1145, 1995

Astronomy and Astrophysics

Astronomy

52

Stars: Imaging - Stars: Individual: Ab Dor - Stars: Late-Type - Stars: Magnetic Fields

Scientific paper

We present the third set of a long-term series of Doppler images of the starspot distribution on AB Doradus, a rapidly rotating active K0 dwarf. The images were obtained from simultaneous spectroscopic and photometric observations taken on the Anglo-Australian Telescope and the European Southern Observatory in 1993 November. Our images show two active latitudes, a low-latitude band producing most of the photometric modulation, and a high-latitude band centred at 60°. The spot distribution at low latitudes is very stable and persists over 5 stellar rotations. It is also remarkably similar to the distribution found in 1992 December. The high-latitude structure is more variable and seems to change on the order of a few rotation periods. In agreement with measurements from 1992 January, we find no indication for differential rotation on AB Doradus.

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