FM13p.11 — Rotational Modulation and Activity Cycles at Rotational Extremes: HII 1883

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Jacquelynne Milingo1, Steven H. Saar2, Laurence A. Marschall1

Institution(s): 1. Gettysburg College, 2. Smithsonian Astrophysical Obs.

We present a 23 yr compilation of V-band differential photometry for the Pleiades K dwarf HII 1883 (V660 Tau). HII 1883 has a rotational period〈Prot〉of ~ 0.235 d and displays significant rotational modulation due to non-uniform surface brightness or "starspots". Preliminary work with 17 years of data yields a cycle period (Pcyc) of ~ 8 years and rotational shear (ΔProt/〈Prot〉) considerably less than solar. With additional data available we compare newly determined Pcyc and ΔProt/〈Prot〉values with those of other stars, including HII 1883 in a larger study of magnetic activity in single cool dwarfs.