Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8704c&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #87.04D; Bulletin of the American Astronomical Society, Vol. 24, p.1262
Astronomy and Astrophysics
Astronomy
Scientific paper
We obtained H and K' images of 59 IRAS sources selected from the coadded images of L1641. Some of these sources were also imaged at narrow-band L and M. The most important result from this work is that we found small groupings of 10--40 near-IR sources in the vicinity of 14 IRAS sources. These groupings, defined as stellar density enhancements (SDEs), are statistically significant compared to background stars. Most of the near-IR sources within the SDEs are low-mass pre--main-sequence stars physically associated with the IRAS sources. Seven of 11 IRAS sources with CO molecular outflows are associated with the SDEs. The SDEs probably result from pile-up of young stars due to continuous star formation within the dense cores, a phenomenon seen in the early stage of star formation. Our images showed that the young stars in L1641 can be characterized by a range of stellar densities, from a large cluster (the Trapezium Cluster) to the SDEs and to individual stars. The previously proposed cluster and isolated star formation modes are probably the high and low ends of the continuous distribution, respectively. With the near-IR imaging, we were able to identify the probable near-IR counterparts for 55 of the 59 IRAS sources, although 9 of them show signs of multiple heating sources within the IRAS beamsize. With these identifications, we found most of the IRAS sources we imaged are class I sources.
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