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Photometric study of NGC 2023 in the 3500 A to 10000 A region - Confirmation of a near-IR emission process in reflection nebulaeA surface brightness study of the reflection nebula NGC 2023 covering the 3500-10,000 A wavelength region performed with uvby photoelectric photometry and BVRI imaging with a CCD detector is reported along with VRI photometry of a cluster of embedded red stars. The nebular radiation in the 3500-5500 A region is dust-scattered starlight originating in the star HD 37903. The embedded red stars are probably pre-main sequence stars. The nebular surface brightness in R and I exceeds that expected on the basis of a reasonable radiative transfer model by factors of two and more than three, respectively. The excess radiation is extended across the nebula in a manner similar to the scattered light. The extended red emission may be interpreted as the high-frequency extension of extended emission discovered by Sellgren, Werner, and Dinerstein (1983) in the 2-5 micron region in NGC 2023 and two other reflection nebulae.
Document ID
19840058939
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Schild, R. E.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Kraiman, J. B.
(Toledo, University Toledo, OH, United States)
Witt, A. N.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Date Acquired
August 12, 2013
Publication Date
June 15, 1984
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 281
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
84A41726
Funding Number(s)
CONTRACT_GRANT: NAGW-89
Distribution Limits
Public
Copyright
Other

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