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Abundances of argon, sulfur, and neon in six galactic H II regions from infrared forbidden linesAirborne measurements of the Ar II (6.99 micron) and S III (18.71 micron) forbidden lines for six compact H II regions are presented, as well as ground-based 2-4 micron and 8-13 micron spectroscopy if not already published. From these data and radio data, lower limits to the elemental abundances of Ar, Ne, and S are deduced. G29.9-0.0, at 5 kpc from the galactic center, is overabundant in all these elements. The other five regions (at distances 6-13 kpc from the center) mainly appear to be consistent with standard abundances, with the exception of G75.84 + 0.4 at 10 kpc from the galactic center, which is overabundant in S. However, preliminary results on G12.8-0.2 at 6 kpc from the galactic center suggest a possible underabundance. A large statistical sample of H II regions is required in order to determine if there is a radial gradient in the heavy element abundances of the Galaxy.
Document ID
19820031710
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Herter, T.
(Rochester Univ. NY, United States)
Helfer, H. L.
(Rochester, University Rochester, NY, United States)
Forrest, W. J.
(Rochester Univ. NY, United States)
Mccarthy, J.
(Rochester Univ. NY, United States)
Houck, J. R.
(Cornell University Ithaca, NY, United States)
Willner, S. P.
(Rochester Univ. NY, United States)
Puetter, R. C.
(Rochester Univ. NY, United States)
Rudy, R. J.
(California, University La Jolla, CA, United States)
Soifer, B. T.
(California Institute of Technology Pasadena, CA, United States)
Pipher, J. L.
(Rochester Univ. NY, United States)
Date Acquired
August 10, 2013
Publication Date
November 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
82A15245
Distribution Limits
Public
Copyright
Other

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