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 |
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container_title | Astrophys. J.; (United States) |
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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. |
doi_str_mv | 10.1086/166200 |
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H. ; Simpson, J. P. ; Erickson, E. F. ; Haas, M. R.</creator><creatorcontrib>Rubin, R. H. ; Simpson, J. P. ; Erickson, E. F. ; Haas, M. R. ; NASA, Ames Research Center, Moffett Field, CA (USA)</creatorcontrib><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.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.1086/166200</identifier><identifier>CODEN: ASJOAB</identifier><language>eng</language><publisher>Legacy CDMS: University of Chicago Press</publisher><subject>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</subject><ispartof>Astrophys. 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R.</creatorcontrib><creatorcontrib>NASA, Ames Research Center, Moffett Field, CA (USA)</creatorcontrib><title>Determination of N/O from far-infrared line observations of Galactic H II regions</title><title>Astrophys. J.; (United States)</title><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.</description><subject>640105 - Astrophysics & Cosmology- Galaxies</subject><subject>ABUNDANCE</subject><subject>Astronomy</subject><subject>Astrophysics</subject><subject>CHARGED PARTICLES</subject><subject>CHEMICAL COMPOSITION</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>COSMIC RADIO SOURCES</subject><subject>Earth, ocean, space</subject><subject>ELECTROMAGNETIC RADIATION</subject><subject>Exact sciences and technology</subject><subject>FAR INFRARED RADIATION</subject><subject>GALAXIES</subject><subject>H ii regions. Emission and reflection nebulae</subject><subject>H2 REGIONS</subject><subject>INFRARED RADIATION</subject><subject>INFRARED SPECTRA</subject><subject>Interstellar medium (ism) and nebulae in milky way</subject><subject>IONS</subject><subject>ISOTOPES</subject><subject>LIGHT NUCLEI</subject><subject>MILKY WAY</subject><subject>NITROGEN 14</subject><subject>NITROGEN IONS</subject><subject>NITROGEN ISOTOPES</subject><subject>NUCLEI</subject><subject>NUCLEOSYNTHESIS</subject><subject>ODD-ODD NUCLEI</subject><subject>OPTICS</subject><subject>OXYGEN IONS</subject><subject>RADIATIONS</subject><subject>SPECTRA</subject><subject>STABLE ISOTOPES</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. 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R.</creator><general>University of Chicago Press</general><scope>CYE</scope><scope>CYI</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19880401</creationdate><title>Determination of N/O from far-infrared line observations of Galactic H II regions</title><author>Rubin, R. H. ; Simpson, J. P. ; Erickson, E. F. ; Haas, M. R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c296t-409c675bb59dd3e6dd728c874449512f141373f1e1116b9ae67b1e9cc2c06d2c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>640105 - Astrophysics & Cosmology- Galaxies</topic><topic>ABUNDANCE</topic><topic>Astronomy</topic><topic>Astrophysics</topic><topic>CHARGED PARTICLES</topic><topic>CHEMICAL COMPOSITION</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COSMIC RADIO SOURCES</topic><topic>Earth, ocean, space</topic><topic>ELECTROMAGNETIC RADIATION</topic><topic>Exact sciences and technology</topic><topic>FAR INFRARED RADIATION</topic><topic>GALAXIES</topic><topic>H ii regions. Emission and reflection nebulae</topic><topic>H2 REGIONS</topic><topic>INFRARED RADIATION</topic><topic>INFRARED SPECTRA</topic><topic>Interstellar medium (ism) and nebulae in milky way</topic><topic>IONS</topic><topic>ISOTOPES</topic><topic>LIGHT NUCLEI</topic><topic>MILKY WAY</topic><topic>NITROGEN 14</topic><topic>NITROGEN IONS</topic><topic>NITROGEN ISOTOPES</topic><topic>NUCLEI</topic><topic>NUCLEOSYNTHESIS</topic><topic>ODD-ODD NUCLEI</topic><topic>OPTICS</topic><topic>OXYGEN IONS</topic><topic>RADIATIONS</topic><topic>SPECTRA</topic><topic>STABLE ISOTOPES</topic><topic>Stellar systems. Galactic and extragalactic objects and systems. The universe</topic><topic>SYNTHESIS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rubin, R. H.</creatorcontrib><creatorcontrib>Simpson, J. P.</creatorcontrib><creatorcontrib>Erickson, E. F.</creatorcontrib><creatorcontrib>Haas, M. R.</creatorcontrib><creatorcontrib>NASA, Ames Research Center, Moffett Field, CA (USA)</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Astrophys. J.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rubin, R. H.</au><au>Simpson, J. P.</au><au>Erickson, E. F.</au><au>Haas, M. R.</au><aucorp>NASA, Ames Research Center, Moffett Field, CA (USA)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Determination of N/O from far-infrared line observations of Galactic H II regions</atitle><jtitle>Astrophys. 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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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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