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IRAS 21391 + 5802 - A study in intermediate mass star formationWe present infrared and millimeter wavelength observations of the cold IRAS source 21391 + 5802 and its associated molecular core. Infrared observations at lambda = 3.5 microns reveal a heavily obscured, central point source which is coincident with a compact lambda = 2.7 mm continuum and C18O emission region. The source radiates about 310 solar luminosities, primarily at FIR wavelengths, suggesting that it is a young stellar object of intermediate mass. The steeply rising spectral energy distribution and the large fraction of the system mass residing in circumstellar material imply that IRAS 21391 + 5802 is in an early stage of evolution. The inferred dust temperature indicates a temperature gradient in the core. A comprehensive model for the surrounding core of dust and gas is devised to match the observed dust continuum emission and multitransition CS emission from this and previous studies. We find a r exp -1.5 +/- 0.2 density gradient consistent with that of a gravitationally evolved core and a total core mass of 380 solar masses. The observed dust emission is most consistent with a lambda exp -1.5 - lambda exp -2 dust emissivity law; for a lambda exp -2 law, the data are best fit by a mass opacity coefficient of 3.6 x 10 exp -3 sq cm/g at lambda = 1.25 mm.
Document ID
19930062286
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wilking, Bruce
(Missouri Univ. Saint Louis, United States)
Mundy, Lee
(NASA Headquarters Washington, DC United States)
Mcmullin, Joseph
(Maryland Univ. College Park, United States)
Hezel, Thomas
(Missouri Univ. Saint Louis, United States)
Keene, Jocelyn
(California Inst. of Technology Pasadena, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: Astronomical Journal
Volume: 106
Issue: 1
ISSN: 0004-6256
Subject Category
Astrophysics
Report/Patent Number
ISSN: 0004-6256
Accession Number
93A46283
Funding Number(s)
CONTRACT_GRANT: NSF AST-91-00306
Distribution Limits
Public
Copyright
Other

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