Abstract
ABSTRACT We have studied the periodicity of the following ten small-amplitude red variables, using Fourier analysis and autocorrelation analysis of AAVSO visual observations: RZ Ari, rho Per, IN Hya, FS Com, W Boo, EU Del, R Lyr, U Del, W Cyg and chi Aqr. All of the M giants show variability on time scales of several tens of days; the degree of regularity varies from star to star. In addition, most of the stars show variability on time scales of several hundreds of days. The cause of the latter variability is not known.
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