The circumstellar structure of IRAS 16293-2422 - (C-18)O, NH3, and CO observations

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168523· OSTI ID:6865769

Mundy, L G; Wootten, H A; Wilking, B A ^[1]

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1. Owens Valley Radio Observatory, Pasadena, CA (USA) National Radio Astronomy Observatory, Charlottesville, VA (USA) Missouri Univ., Saint Louis (USA)

Interferometric observations of the (C-18)O and (C-12)O J = 1-0 transitions, and the NH3 (1, 1) and (2, 2) transitions toward the young far-IR source IRAS 16293-2422 are presented. The data reveal elongated gas structures which are aligned perpendicular to the axis of a bipolar outflow and to the local magnetic field direction. By combining the interferometric data with single-dish spectra of the (C-18)O and (C-17)O lines, a comprehensive model for the IRAS 16293-2422 region is developed. In this model, the compact (C-18)O line and 40 K dust emission arise from rotating material within which the central heat source is embedded. The NH3 emission is distributed in a ring with radius 3000 to 4000 AU surrounding the central disk. The dearth of ammonia emission from the (C-18)O emission region is attributed to an actual decrease in NH3 abundance. 15 refs.

• OSTI ID: 6865769
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 352; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
AMMONIA
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC RAY SOURCES
ELECTROMAGNETIC RADIATION
ELEMENT ABUNDANCE
EMISSION SPECTRA
FAR INFRARED RADIATION
FLUID FLOW
GAS FLOW
HYDRIDES
HYDROGEN COMPOUNDS
INFRARED RADIATION
INTERFEROMETRY
INTERSTELLAR MAGNETIC FIELDS
INTERSTELLAR SPACE
MAGNETIC FIELDS
NEBULAE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
PROTOSTARS
RADIATIONS
SPACE
SPECTRA
STAR EVOLUTION