Rotational modulation, shear, and cyclic activity in HII 1883

Details Rotational modulation, shear, and cyclic activity in HII 1883 Rotational modulation, shear, and cyclic activity in HII 1883

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..273...74m&link_type=abstract

The Physics of Sun and Star Spots, Proceedings of the International Astronomical Union, IAU Symposium, Volume 273, p. 74-77

Physics

Stars: Activity, Stars: Late-Type, Stars: Spots, Stars: Rotation

Scientific paper

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 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/ 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, , and Prot over the cycle.

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