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RS CVN Stars in the AAVSO Photoelectric Photometry Program
We report V Photometry of three RS CVn stars--HK Lac, SZ Psc, and LambdaAnd--from the AAVSO photoelectric photometry program, and fromtransformed Hipparcos photometry, over 3500 days. Eighteen photoelectricphotometry observers contributed to this project. The stars vary onperiods of days to weeks, due to rotation of a spotted photosphere. Therotational light curves vary on time scales of months to years, due tochanges in the area and/or distribution of the spots.
| Photometric observations of RS Canum Venaticorum stars
Photometric observations of the following RS CVn stars are presented anddiscussed: HR 3 (33 Psc), HR 373 (39 Cet), LX Per, HR 4374 (53 UMa), HR4665, HR 7275, HK Lac, HR 8448 (AR Lac), HR 8575, HR 8703 and SZ Psc.Observations of HR 3 and HR 8448 are fragmentary. HR 4374 is notphotometrically variable. For the other stars, the range, phase andshape of the photometric distortion wave have been determined.
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