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RS CVN Stars in the AAVSO Photoelectric Photometry Program

Percy, John R.; Soondarsingh, Devi; Velocci, Vince

We report V Photometry of three RS CVn stars--HK Lac, SZ Psc, and Lambda 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 …

Single Channel Photoelectric Photometry of RZ Arietis, 1983-2001

Thompson, Raymond R.

The AAVSO Photoelectric Photometry Archives contain 568 V observations of the SRb star RZ Ari covering 17 years. During this time, there are 22 clearly defined cycles evident in the data, ranging from 26 to 71 days and giving an average period of 51.32 days. Assuming a V magnitude of 5.87 for the comparison star, RZ Ari varied from 5.45 to 6.19, g…