Description
The results of a photometric monitoring in the wavelength range 1-20um are presented for 37 oxygen-rich sources. The sample contains optically identified miras (13), M-type supergiants (3), type II OH/IR sources (20) and one unidentified object. Each source was observed on at least 13 occasions (up to 42) over a lapse of at least 1250 days (up to 2150) between 1984 and 1990 with the ESO 1-m telescope equipped with its standard infrared photometer.
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