Free Access
Issue
Astron. Astrophys. Suppl. Ser.
Volume 120, Number 1, November_II 1996
Page(s) 127 - 138
DOI https://doi.org/10.1051/aas:1996279
Published online 15 November 1996
UBVRI photometric monitoring of 7 rapidly rotating late-type dwarfs in the Alpha Persei cluster DOI: 10.1051/aas:1996279

Astronomy and Astrophysics Supplement Series, Vol. 120, November II 1996, 127-138

UBVRI photometric monitoring of 7 rapidly rotating late-type dwarfs in the Alpha Persei cluster gif

J. Bouvier

Laboratoire d'Astrophysique, Observatoire de Grenoble, Université Joseph Fourier, B.P. 53X, 38041 Grenoble Cedex, France
bouvier@gag.observ-gr.fr
Canada-France-Hawaii Telescope Corporation, P.O. Box 1597, Kamuela, HI 96743, U.S.A.
bouvier@cfht.hawaii.edu

Received February 7; accepted April 15, 1996

Abstract:

The UBVRI light curves of 7 late-type dwarfs amongst the fastest rotators of the Alpha Per cluster (140 km s ) are presented. The shape of the light curves suggests that the photometric variations are most often dominated by a single group of cool spots located at intermediate or high latitude on the stellar surface. Assuming that starspots are good tracers of the stellar magnetic field, the smooth light curves indicate the existence of a large scale, slowly varying magnetic structure at the surface of these ultrafast rotators.

Key words: stars: magnetic fields --- stars: rotation --- stars: activity --- stars: late type --- open clusters and associations: individual: Alpha Persei


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