Detection of H2O Maser Emission from Four Infrared Sources,
OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF
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Maser emission from interstellar water vapor has been found towards four infrared sources OMC-2, OH231.84.2 also known as OH0739-14, S140-IR and Monoceros R2. Three of these new maser sources appear to be situated in active sites of star formation, while the unusual source OH231.84.2 is more likely to be related to a late-type stellar object. The line profiles are relatively simple, showing at most a few velocity components, some of which vary with a time scale as short as a few weeks. The individual sources are discussed in detail.