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Title:
The nature of AFGL 2591 and its associated molecular outflow Infrared and millimeter-wave observations
Authors:
Lada, C. J.; Thronson, H. A., Jr.; Smith, H. A.; Schwartz, P. R.; Glaccum, W.
Affiliation:
AA(Steward Observatory, Tucson, AZ; Wyoming Infrared Observatory, Laramie, WY), AB(Wyoming Infrared Observatory, Laramie, WY), AC(U.S. Navy, E.O. Hulburt Center for Space Research, Washington, DC), AD(U.S. Navy, E.O. Hulburt Center for Space Research, Washington, DC), AE(Yerkes Observatory, Williams Bay, WI)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 302-309. USAF-supported research. Previously announced in STAR as N84-26526. (ApJ Homepage)
Publication Date:
11/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
INFRARED ASTRONOMY, INFRARED STARS, MOLECULAR CLOUDS, MOLECULAR GASES, PROTOSTARS, STELLAR MASS EJECTION, CARBON MONOXIDE, DUST, INFRARED PHOTOMETRY, INFRARED SPECTRA, STELLAR LUMINOSITY, STELLAR SPECTRA, WATER MASERS
DOI:
10.1086/162599
Bibliographic Code:
1984ApJ...286..302L

Abstract

The results of infrared photometry from 2 to 160 microns of AFGL and CO(12) observations of its associated molecular cloud and high velocity molecular outflow are presented and discussed. The observed solar luminosity is 6.7 x 10(4) at a distance of 2 kpc. The spectrum of AFGL 2591 is interpreted in the context of a model in which a single embedded object is the dominant source of the infrared luminosity. This object is determined to be surrounded by a compact, optically thick dust shell with a temperature in excess of several hundred degrees kelvin. The extinction to this source is estimated to be between 26 and 50 visual magnitudes. The absolute position of the infrared sources at 10 microns was determined to an accuracy of + or - 1 in. This indicates for the first time that the IR source and H2O source are not coincident. The CO(12) observations show the high-velocity molecular flow near AFGL 2591 to be extended, bipolar and roughly centered on the infrared emission. The observations suggest that the red-shifted flow component extends beyond the boundary of the ambient cloud within which AFGL 2591 is embedded. The CO(12) observations also show that AFGL 2591 is embedded in a molecular cloud with an LSR velocity of -5 km/s.

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