Other
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apjs...30..259d&link_type=abstract
Astrophysical Journal Supplement Series, vol. 30, Mar. 1976, p. 259-271.
Other
61
Hydroxyl Emission, Infrared Stars, M Stars, Microwave Emission, Water Vapor, Interstellar Extinction, Optical Properties, Secular Variations, Silicon Oxides, Stellar Spectrophotometry
Scientific paper
Twenty-two new infrared stars with microwave water-vapor emission have been found, all but four of which are optically identified long-period variables. They are heavily reddened, late M stars that commonly show time variations. Hydroxyl emission is present in all but a few instances. Excited-state SiO emission is seen in many H2O-infrared stars (although about half have not yet been checked). Those that are Mira variables always have a visual change of more than 6 magnitudes during their light cycle. Other optical and infrared properties are discussed.
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