Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7380h&link_type=abstract
HST Proposal ID #7380
Computer Science
Hst Proposal Id #7380 Interstellar Matter
Scientific paper
IC 349 is the brightest area in the Pleiades reflection nebulosity, by a factor of about 15. Discovered visually by Barnard in 1890, it is a difficult object because it is only about 30" from 23 Tau, of V=4.2. It is fan-shaped with the axis pointing ve ry nearly toward 23 Tau. Its blue color and the fact that its spectrum appears identical to that of the star shows that it also is a reflection nebula. The general Pleiades nebulosity is the result of a chance encounter between the cluster and a molecul ar cloud which may be a fragment of the Tau-Aur MC complex. It is proposed that the semi-stellar object at the head of IC 349 is part of that cloud and is being dissipated in the radiation field of 23 Tau as it approaches that star. The shape of the fan of IC 349 is compatible with a model in which small dust particles ejected from the nucleus are being swept away by radiation pressure from 23 Tau. It is unknown whether the nucleus is a dust- enshrouded pre-main-sequence star or a dense condensation of gas and dust several hundred A.U. in diameter. Multicolor imaging with the Planetary Camera is proposed here which may reveal whether such a protostar lies inside the nucleus, and will also display the morphology of the entire IC 349 nebula in much more exquisite detail than can be achieved from the ground.
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