UBVRI Photometry of the Solar Neighborhood Pleiades-Age K Dwarfs HD 17925 and HD 1405

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Session 22 -- Stellar Spectroscopy, Atmospheres, Models, Intrinsic Variables, Theory, Part II
Display presentation, Tuesday, June 13, 1995, 9:20am - 6:30pm

[22.10] UBVRI Photometry of the Solar Neighborhood Pleiades-Age K Dwarfs HD 17925 and HD 1405

B.P. Abbott, B.H. Pomerance, C.W. Ambruster (Villanova University)

We report a photometric modulation period for the nearby (d=7.9 pc) Pleiades-age K2 dwarf HD 17925 of 6.9 d, in reasonable agreement with the Ca H+K modulation period of 6.6 d reported by Noyes etal \ in 1984. Perhaps not surprisingly for a star this young, the shape of the light curve changed significantly over a three week period. The three-month light curve for HD 1405 (K2 V; P=1.75 d) showed one flare ($\Delta U \sim 0.2$) at photometric minimum. The UBVRI observations were obtained with the 0.8-m Four College Automated Photometric Telescope (APT) on Mt. Hopkins, AZ, during the Fall 1994 observing season.

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