NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Distribution of forbidden neutral carbon emission in the ring nebula (NGC 6720)The spatial distribution of forbidden C I 9823, 9850 A emission in NGC 6720 is reported. Like forbidden O I, the forbidden C I radiation appears enhanced in the region of the bright filaments. A few percent of the carbon atoms in the filaments are neutral. The neutral fraction is consistent with ionization equilibrium calculations made under the assumption of complete shielding of direct stellar radiation by hydrogen. The observed carbon lines are excited by photoelectrons produced from hydrogen by the nebular diffuse radiation field. The forbidden C I observations confirm that the filaments in NGC 6720 are regions of locally enhanced shielding.
Document ID
19830052875
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/160989
Authors
Jewitt, D. C. (California Inst. of Tech. Pasadena, CA, United States)
Danielson, G. E. (Palomar Observatory; California Institute of Technology Pasadena, CA, United States)
Kupferman, P. N. (California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Maran, S. P. (NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
May 15, 1983
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 268
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
83A34093
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.

Related Records

There are no records associated with this record.
No Preview Available