Possible Young Stellar Objects without Detectable CO Emission

Details Possible Young Stellar Objects without Detectable CO Emission Possible Young Stellar Objects without Detectable CO Emission

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..173i&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Physics

Scientific paper

We discovered about 20 possible Young Stellar Objects (YSOs) which are invisible both in optical and near-infrared wavelengths, do not have detectable 12CO emission and locate avoiding molecular clouds. Wouterloot and Brand (1989) searched 1302 IRAS point sources with reliable fluxes at 25, 60, and 100 μm near the galactic plane for 12CO(J=1-0) line, and detected CO emission for 83% of them. We checked literature and optical images of their sources without detectable CO emission, and carried out near-infrared imaging observations for 55 objects without CO emission and optical counterpart. We found that at least 18 objects are also invisible at near-infrared wavelengths. These objects are highly concentrated around the galactic plane and dispersely distributed avoiding molecular clouds. The distances are estimated to be 1 kpc and their induced infrared luminosities are 4 96 Lodot (average 27 Lodot). The infrared spectral indices between 2.2 μm and 25 μm correspond to those of Class I YSOs, and the IRAS infrared colors are similar to colors of usual YSOs rather than those of cirrus and cold dust associated with early-type stars. The objects are possible YSOs with unusually low CO abundance in their envelopes.

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