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RS CVN STARS IN THE AAVSO photoelectric photometry PROGRAM

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John R. Percy

Devi Soondarsingh

Vince Velocci

Department of Astronomy

Erindale Campus

University of Toronto

Mississauga, ON L5L 1C6

Canada

Received January 30, 2001

Abstract

We report V photometry of three RS CVn stars-HK Lac, SZ Psc, and l And-from the AAVSO photoelectric photometry program, and from transformed Hipparcos photometry, over 3500 days. Eighteen photoelectric photometry observers contributed to this project. The stars vary on periods of days to weeks, due to rotation of a spotted photosphere. The rotational light curves vary on time scales of months to years, due to changes in the area and/or distribution of the spots.

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