Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..129o&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Physics
4
Scientific paper
We have carried out interferometric observations of protostellar and pre-protostellar envelopes in Taurus. Protostellar envelopes are dense gaseous condensations with young stellar objects or protostars, while pre-protostellar envelopes, which are also called starless cores, are those without any known young stellar objects. Our c18o J=1-0 mini survey of 8 protostellar envelopes shows that they have flattened structures with a scale of 1000 AU and often indicate velocity patterns that can be explained by motions of infall and rotation. Our CCS JN=32-21 observations of pre-protostellar envelopes demonstrate that they show elongated or flattened structures, similar to protostellar envelopes. In contrast to the protostellar envelopes, however, pre-protostellar envelopes are more extended (typically 10000 AU scale), very clumpy, and show narrow line widths (typically 0.1-0.2 km s-1). One pre-protostellar envelope, L1544, shows a remarkable velocity pattern, which can be explained in terms of infall and rotation. Physical properties of infalling protostellar and pre-protostellar envelopes are discussed in detail.
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