Far-infrared and submillimeter-wavelength observations of star-forming dense cores. I. Spectra

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169553· OSTI ID:6261423

Ladd, E F; Adams, F C; Fuller, G A; Casey, S; Davidson, J A ^[1]

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1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA) Yerkes Observatory, Williams Bay, WI (USA) NASA, Ames Research Center, Moffett Field, CA (USA)

Far-infrared and submillimeter photometry of 10 low-mass star formation regions containing embedded IRAS sources is presented. These new observations define the peak of the spectral energy distributions of these objects and provide more precise estimates of their bolometric luminosities. Two new sources, L1527 and L483, are among the reddest known low-mass objects, with spectral energy distribution peaks at 100-200 microns and extremely steep IRAS slopes. These cold sources have spectra which are similar to blackbodies of 30-40 K but have significant excess emission on the Wien side. Models of the spectral energy distributions using a spherically symmetric core structure indicate that these sources have visual extinctions greater than 1000 mag. However, models with these large extinctions predict too little near-infrared emission. A nonspherically symmetric distribution of circumstellar material may play a role in the generation of the extra near-infrared emission. 64 refs.

• OSTI ID: 6261423
• Journal Information: Astrophysical Journal; (USA), Vol. 366; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PROTOSTARS
FAR INFRARED RADIATION
NEAR INFRARED RADIATION
EMISSION SPECTRA
ENERGY SPECTRA
LUMINOSITY
MASS
MATHEMATICAL MODELS
SPECTROPHOTOMETRY
STAR EVOLUTION
ELECTROMAGNETIC RADIATION
INFRARED RADIATION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources