Variability of H2O maser sources at wavelength 1. 35 CM. II. Stellar masers

In [I--3], the results were given of spectroscopic observations at wavelength 1.35 cm made with the radio telescope RATAN-600 in the period from May 1981 through June 1985. In this paper, we give the results of observations of 27 nonstellar maser sources obtained in the period 1985--1988. In discussing the variability of W 3(OH), Ori A, W 49, and W 51 we shall also use observational results obtained earlier in order to supplement the observational material. Observations of GGD 25 and Sgr B2 made before 1987 are discussed in detail in [3]. Therefore, we present here only the results of the observations after 1988.