Abstract
High spectral resolution observations of den se cores in lines of NH3 have provided no dear evidence for infall, even when the cores possess embedded low mass protostars or young stellar objects (Menten et al. , 1984; Menten and Walmsley, 1985; Myers and Benson, 1983). Infall is expected to continue until protostellar winds begin to affect the dynamics of the cores.
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