Abundances in galactic H2 regions, 3: G25. 4-0. 2, G45. 5+0. 06, M8, S159 and DR22

Technical Report · Fri Jun 01 04:00:00 EDT 1984

OSTI ID:6435667

Pipher, J L; Helfner, H L; Herter, T; Briotta, Jr, D A; Houck, J R; Willner, S P; Jones, B

Measurements of the ARII (6.99 microns), ArIII (8.99 microns), NeII (12.81 microns), SIII (18.71 microns), and SIV (10.51 microns) lines are presented for five compact HII regions along with continuum spectroscopy. From these data and radio data, lower limits to the elemental abundances of Ar, S, and Ne were deduced. The complex G25.4-0.2 is only 5.5 kpc from the galactic center, and is considerably overabundant in all these elements. Complex G45.5+0.06 is at seven kpc from the galactic center, and appears to be approximately consistent with solar abundance. The complex S159 in the Perseus Arm, at 12 kpc from the galactic center, has solar abundance, while M8 in the solar neighborhood may be somewhat overabundant in Ar and Ne. Complex DR 22, at 10 kpc from the galactic center in the Cygnus Arm, is overabundant in Ar. A summary of results from a series of papers on abundances is given.

• Research Organization: National Aeronautics and Space Administration, Washington, DC (USA)
• OSTI ID: 6435667
• Report Number(s): N-84-27616; NASA-TM-85962; A-9756
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ARGON
CHEMICAL COMPOSITION
COSMIC RADIO SOURCES
ELEMENTS
FINE STRUCTURE
FLUIDS
GALAXIES
GASES
H2 REGIONS
HYDROGEN
INFRARED SPECTRA
MEASURING INSTRUMENTS
NEON
NONMETALS
RARE GASES
SPECTRA
SPECTROMETERS
STARS
SULFUR