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Rotational modulation, shear, and cyclic activity in HII 1883

Published online by Cambridge University Press:  26 August 2011

J. B. Milingo ,
S. H. Saar ,
L. A. Marschall  and
J. R. Stauffer
J. B. Milingo
Affiliation:
Department of Physics, Gettysburg College, Gettysburg, PA 17325, USA email: jmilingo@gettysburg.edu, marschal@gettysburg.edu
S. H. Saar
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA email: saar@head.cfa.harvard.edu
L. A. Marschall
Affiliation:
Department of Physics, Gettysburg College, Gettysburg, PA 17325, USA email: jmilingo@gettysburg.edu, marschal@gettysburg.edu
J. R. Stauffer
Affiliation:
Spitzer Science Center, Pasadena, CA 91125, USA email: stauffer@ipac.caltech.edu
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Abstract

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We present a 30 year compilation of V-band differential photometry for the Pleiades K dwarf HII 1883. HII 1883 has an average rotational period 〈Prot〉 of ~0.235d and displays rotational modulation due to non-uniform surface brightness as large as 0.2 magnitudes in V. Preliminary work yields a cycle period of ~9yrs and rotational shear δProt/〈Prot〉 considerably less than solar. With such a long baseline of data available we can explore many aspects of the star's photometric variability. We present studies of the variation of the rotational modulation amplitude, 〈V〉, and Prot over the cycle.

Keywords

Stars: activitystars: late-typestars: spotsstars: rotation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 74 - 77
Copyright
Copyright © International Astronomical Union 2011

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