Results of AAVSO Photoelectric Photometry Observations RS CVn (Abstract)

Volume 28 number 1 (2000)

Devi Soondarsingh

John R. Percy

Abstract

(Abstract only) RS CVn stars are spotted, sun-like stars which vary because of the rotation of their spotted surface. There are three RS CVn stars in the AAVSO Photoelectric Photometry Program—lambda And, HK Lac, and SZ Psc—and these stars have been observed over many years. We present the results of these observations, including the period and period change (which depend on the rotation period, and the longitudinal migration of the spots), and the amplitude, shape, and mean magnitude of the light curve (which depend on the number and distribution of the spots). These change from season to season, and the AAVSO photoelectric photometry observations are useful for studying these long-term changes.