Determination of N/O from far-infrared line observations of Galactic H II regions

Measurements of the 52- and 88-micron forbidden O III line ratios and the 57-micron forbidden N III line ratio for six H II regions have been obtained with the NASA Kuiper Airborne Observatory. The derived N/O ratio for most Galactic regions (of about 0.2-0.3) is greater than that obtained by optica...

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Veröffentlicht in:Astrophys. J.; (United States) 1988-04, Vol.327 (1), p.377-388
Hauptverfasser: Rubin, R. H., Simpson, J. P., Erickson, E. F., Haas, M. R.
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container_issue 1
container_start_page 377
container_title Astrophys. J.; (United States)
container_volume 327
creator Rubin, R. H.
Simpson, J. P.
Erickson, E. F.
Haas, M. R.
description Measurements of the 52- and 88-micron forbidden O III line ratios and the 57-micron forbidden N III line ratio for six H II regions have been obtained with the NASA Kuiper Airborne Observatory. The derived N/O ratio for most Galactic regions (of about 0.2-0.3) is greater than that obtained by optical studies, and it exceeds the solar value. Although enhancement of N/O at a galactocentric distance of about 6 kpc may be possible, no evidence is found for an overall linear gradient in N/O with galactocentric distance, suggesting that N-14 is predominantly produced by primary rather than secondary nucleosynthesis.
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J.; (United States)</jtitle><date>1988-04-01</date><risdate>1988</risdate><volume>327</volume><issue>1</issue><spage>377</spage><epage>388</epage><pages>377-388</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>Measurements of the 52- and 88-micron forbidden O III line ratios and the 57-micron forbidden N III line ratio for six H II regions have been obtained with the NASA Kuiper Airborne Observatory. The derived N/O ratio for most Galactic regions (of about 0.2-0.3) is greater than that obtained by optical studies, and it exceeds the solar value. Although enhancement of N/O at a galactocentric distance of about 6 kpc may be possible, no evidence is found for an overall linear gradient in N/O with galactocentric distance, suggesting that N-14 is predominantly produced by primary rather than secondary nucleosynthesis.</abstract><cop>Legacy CDMS</cop><pub>University of Chicago Press</pub><doi>10.1086/166200</doi><tpages>12</tpages></addata></record>
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ispartof Astrophys. J.; (United States), 1988-04, Vol.327 (1), p.377-388
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source NASA Technical Reports Server; Alma/SFX Local Collection
subjects 640105 - Astrophysics & Cosmology- Galaxies
ABUNDANCE
Astronomy
Astrophysics
CHARGED PARTICLES
CHEMICAL COMPOSITION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COSMIC RADIO SOURCES
Earth, ocean, space
ELECTROMAGNETIC RADIATION
Exact sciences and technology
FAR INFRARED RADIATION
GALAXIES
H ii regions. Emission and reflection nebulae
H2 REGIONS
INFRARED RADIATION
INFRARED SPECTRA
Interstellar medium (ism) and nebulae in milky way
IONS
ISOTOPES
LIGHT NUCLEI
MILKY WAY
NITROGEN 14
NITROGEN IONS
NITROGEN ISOTOPES
NUCLEI
NUCLEOSYNTHESIS
ODD-ODD NUCLEI
OPTICS
OXYGEN IONS
RADIATIONS
SPECTRA
STABLE ISOTOPES
Stellar systems. Galactic and extragalactic objects and systems. The universe
SYNTHESIS
title Determination of N/O from far-infrared line observations of Galactic H II regions
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