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Small-Amplitude Red Variables in the AAVSO Photoelectric Program: Light Curves and Periods
John R. Percy, Adrien Desjardins, Lawrence Yu and Howard J. Landis
Publications of the Astronomical Society of the Pacific
Vol. 108, No. 720 (1996 February), pp. 139-145
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40680697
Page Count: 7
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Small-amplitude red variables (SARVs) are M giants or supergiants which are pulsating with small amplitudes (up to 2.5 mag) and with time scales of 20-200 days or more. This paper reports on a 10-yr study of about two dozen SARVs, carried out through the American Association of Variable Star Observers (AAVSO) photoelectric photometry program. It has provided detailed information on the regularity, period, and amplitude of these stars. Most have well-defined periods in the 20-200 day range.Several also have a long secondary period. One (W Boo) appears to have two periods with a ratio of 2.3.
Publications of the Astronomical Society of the Pacific © 1996 The University of Chicago Press