Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4314c&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #43.14; Bulletin of the American Astronomical Society, Vol. 24, p.798
Astronomy and Astrophysics
Astronomy
Scientific paper
We have imaged 59 IRAS sources in the dark cloud L1641 at H (1.65 microns) and K' (2.1 microns) using the NICMOS 3 camera on the UH 2.2-m telescope. Each image covers a 4' times 4' area centered on the IRAS source. Additional nbL (3.4 microns) and M (4.8 microns) images were obtained for 24 of these sources at the IRTF and the UKIRT. The 3 sigma limiting magnitudes are H=17.5 and K'=17.5, nbL=13, and M=11. The major results are: (1) At least ten of the IRAS sources show a stellar surface density enhancement compared to the surrounding areas. Three sources (05338-0624, 05339-0626, and 05363-0702) were studied in detail and show convincing evidence that the surrounding stars are young stellar objects, including T-Tauri stars. Star formation may not have been coeval within these IRAS complexes. (2) The large wavelength-dependent position shift of several embedded sources and their association with nebulosity suggest that scattered light plays an important role at H and K'. Imaging at nbL and M were important in identifying the location of the embedded source. (3) With the H, K', nbL and M images, we were able to identify the counterparts of most IRAS sources we imaged. In particular, we detected a very cold source (only detectable in M) as the near-infrared counterpart of 053380-0624 (also known as L1641-North). (4) We used the first moment of the flux density distribution (the mean-wavelength) of the IRAS sources as a measure of the peak of the spectral energy distribution. Except for a few sources that have scattered light, the H-K' color is well correlated with the mean-wavelength.
Chen Haibin
Tokunaga Alan T.
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