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Stellar density enhancements associated with IRAS sources in L1641We obtained H and K' images of 59 Infrared Astronomical Satellite (IRAS) sources associated with dense molecular gas in L1641. Some of the sources were also imaged in narrow-band L and M. Using these near-IR images and photometry, we are able to identify the near-IR counterparts for most of the IRAS sources. The spectral energy distributions of the sources suggest that all of them are young stellar objects (class I and II sources). Most importantly, we find in this study that 14 IRAS sources are associated with small (but statistically significant) groupings of bright near-IR sources defined as stellar density enhancements (SDEs). The spatial distribution of young stars in the Orion A molecular cloud can be characterized by a range of stellar densities, from the Trapezium Cluster, to the SDEs, to individual stars. We conjecture that the SDEs are regions of continuous star formation within or around dense molecular cores and that they may represent an important mode of star formation in L1641. If true, adjustments to the standard star formation model may be required.
Document ID
19950032419
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Chen, Hua
(Univ. of Hawaii, Honolulu, HI United States)
Tokunaga, Alan T.
(Univ. of Hawaii, Honolulu, HI United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 90
Issue: 1
ISSN: 0067-0049
Subject Category
Astrophysics
Accession Number
95A64018
Funding Number(s)
CONTRACT_GRANT: NAGW-2278
Distribution Limits
Public
Copyright
Other

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