Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..149c&link_type=abstract
Astrophysical Journal Supplement Series, vol. 90, no. 1, p. 149-172
Astronomy and Astrophysics
Astronomy
41
Augmentation, Infrared Astronomy, Infrared Astronomy Satellite, Infrared Photometry, Orion Nebula, Pre-Main Sequence Stars, Spatial Distribution, Spectral Energy Distribution, Stellar Mass, Stellar Models, Cameras, Data Reduction, Infrared Detectors, Infrared Filters, Infrared Imagery, Infrared Telescopes
Scientific paper
We 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.
Chen Hua
Tokunaga Alan T.
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