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Orion A helium abundance

Journal Article · · Sov. Astron. Lett. (Engl. Transl.); (United States)
OSTI ID:5605211
; ; ;
The 22.4-GHz (H,He)66-alpha and 36.5-GHz (H,He)56-alpha radio recombination lines have been observed at several Jaffe-Pankonin positions in the central part of the Orion A source. The measured relative abundance of ionized helium increases with distance, averaging 11.6 percent at peripheral points. The observed behavior is interpreted by a blister-type model nebula, which implies that Orion A has a true He abundance of 12 percent, is moving with a radial velocity of 5 km/sec, and is expanding. 18 references.
Research Organization:
Fizicheskii Institut, Moscow, USSR
OSTI ID:
5605211
Journal Information:
Sov. Astron. Lett. (Engl. Transl.); (United States), Journal Name: Sov. Astron. Lett. (Engl. Transl.); (United States) Vol. 12; ISSN SALED
Country of Publication:
United States
Language:
English

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Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ABUNDANCE
CHARGED PARTICLES
CHEMICAL COMPOSITION
COSMIC RADIO SOURCES
DATA PROCESSING
ELEMENTS
FLUIDS
GASES
H2 REGIONS
HELIUM
HELIUM IONS
IONS
NONMETALS
PROCESSING
RARE GASES
SPECTRA