<> <http://www.w3.org/2000/01/rdf-schema#comment> "The repository administrator has not yet configured an RDF license."^^<http://www.w3.org/2001/XMLSchema#string> . <> <http://xmlns.com/foaf/0.1/primaryTopic> <https://discovery.ucl.ac.uk/id/eprint/10093774> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/AcademicArticle> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Article> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/terms/title> "Herschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/ontology/bibo/abstract> "For three nebulae that have early-WN Wolf–Rayet exciting stars, NGC 6888, WR 8 and Abell 48, we have obtained Herschel-PACS line scans of the [N III] 57-μm and [O III] 88-μm lines, along with the 122- and 205-μm lines of [N II]. From the former two lines we have derived N2+/O2+ abundance ratios, equal to the overall N/O ratio under a wide range of nebular conditions. We find that all of the nebulae observed possess significant nitrogen enrichment, with derived N/O ratios greater than solar. The two nebulae with massive Wolf–Rayet exciting stars, NGC 6888 and WR 8 are found to have N/O ratios that are enhanced by factors of 7 – 10 relative to the solar N/O ratio, consistent with an origin as material ejected just before the onset of the Wolf–Rayet phase. The other nebula, Abell 48, has recently been reclassified as a member of the rare class of three planetary nebulae that have early-WN central stars and are not of Peimbert type I. We derive a nebular N/O ratio for it that is a factor of 4 enhanced relative to solar and slightly above the range of N/O values that have been measured for the other three members of its [WN] planetary nebula class."^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/terms/date> "2014-07-11" . <https://discovery.ucl.ac.uk/id/document/1092432> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Document> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/ontology/bibo/volume> "441" . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/ontology/bibo/issue> "4" . <https://discovery.ucl.ac.uk/id/org/ext-fef0210621b463ea6872dff71124d367> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Organization> . <https://discovery.ucl.ac.uk/id/org/ext-fef0210621b463ea6872dff71124d367> <http://xmlns.com/foaf/0.1/name> "OXFORD UNIV PRESS"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/terms/publisher> <https://discovery.ucl.ac.uk/id/org/ext-fef0210621b463ea6872dff71124d367> . <https://discovery.ucl.ac.uk/id/publication/ext-ab17aefafc7ceb2a0e91dd7c3f45da0d> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Collection> . <https://discovery.ucl.ac.uk/id/publication/ext-ab17aefafc7ceb2a0e91dd7c3f45da0d> <http://xmlns.com/foaf/0.1/name> "Monthly Notices of the Royal Astronomical Society"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/terms/isPartOf> <https://discovery.ucl.ac.uk/id/publication/ext-ab17aefafc7ceb2a0e91dd7c3f45da0d> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/ontology/bibo/status> <http://purl.org/ontology/bibo/status/published> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-c36138d347490f86a21edc4ec65e0b9f> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/10093774#authors> . <https://discovery.ucl.ac.uk/id/eprint/10093774#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> <https://discovery.ucl.ac.uk/id/person/ext-c36138d347490f86a21edc4ec65e0b9f> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-5a9ee2193ebd3318476106d978a54399> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/10093774#authors> . <https://discovery.ucl.ac.uk/id/eprint/10093774#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> <https://discovery.ucl.ac.uk/id/person/ext-5a9ee2193ebd3318476106d978a54399> . <https://discovery.ucl.ac.uk/id/person/ext-c36138d347490f86a21edc4ec65e0b9f> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-c36138d347490f86a21edc4ec65e0b9f> <http://xmlns.com/foaf/0.1/givenName> "DJ"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c36138d347490f86a21edc4ec65e0b9f> <http://xmlns.com/foaf/0.1/familyName> "Stock"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c36138d347490f86a21edc4ec65e0b9f> <http://xmlns.com/foaf/0.1/name> "DJ Stock"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-5a9ee2193ebd3318476106d978a54399> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-5a9ee2193ebd3318476106d978a54399> <http://xmlns.com/foaf/0.1/givenName> "MJ"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-5a9ee2193ebd3318476106d978a54399> <http://xmlns.com/foaf/0.1/familyName> "Barlow"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-5a9ee2193ebd3318476106d978a54399> <http://xmlns.com/foaf/0.1/name> "MJ Barlow"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/EPrint> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/ArticleEPrint> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/terms/isPartOf> <https://discovery.ucl.ac.uk/id/repository> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092432> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/1092432> <http://www.w3.org/2000/01/rdf-schema#label> "Herschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars (Text)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://purl.org/dc/elements/1.1/hasVersion> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://eprints.org/ontology/hasPublished> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092432> <http://eprints.org/ontology/hasFile> <https://discovery.ucl.ac.uk/id/eprint/10093774/7/Barlow_stu724.pdf> . <https://discovery.ucl.ac.uk/id/document/1092432> <http://purl.org/dc/terms/hasPart> <https://discovery.ucl.ac.uk/id/eprint/10093774/7/Barlow_stu724.pdf> . <https://discovery.ucl.ac.uk/id/eprint/10093774/7/Barlow_stu724.pdf> <http://www.w3.org/2000/01/rdf-schema#label> "Barlow_stu724.pdf"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/1092433> . <https://discovery.ucl.ac.uk/id/document/1092433> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/1092433> <http://www.w3.org/2000/01/rdf-schema#label> "Herschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/1092433> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092433> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092433> <http://eprints.org/relation/islightboxThumbnailVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092433> <http://eprints.org/ontology/hasFile> <https://discovery.ucl.ac.uk/id/eprint/10093774/8/lightbox.jpg> . <https://discovery.ucl.ac.uk/id/document/1092433> <http://purl.org/dc/terms/hasPart> <https://discovery.ucl.ac.uk/id/eprint/10093774/8/lightbox.jpg> . <https://discovery.ucl.ac.uk/id/eprint/10093774/8/lightbox.jpg> <http://www.w3.org/2000/01/rdf-schema#label> "lightbox.jpg"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/1092434> . <https://discovery.ucl.ac.uk/id/document/1092434> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/1092434> <http://www.w3.org/2000/01/rdf-schema#label> "Herschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/1092434> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092434> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092434> <http://eprints.org/relation/ispreviewThumbnailVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092434> <http://eprints.org/ontology/hasFile> <https://discovery.ucl.ac.uk/id/eprint/10093774/9/preview.jpg> . <https://discovery.ucl.ac.uk/id/document/1092434> <http://purl.org/dc/terms/hasPart> <https://discovery.ucl.ac.uk/id/eprint/10093774/9/preview.jpg> . <https://discovery.ucl.ac.uk/id/eprint/10093774/9/preview.jpg> <http://www.w3.org/2000/01/rdf-schema#label> "preview.jpg"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/1092435> . <https://discovery.ucl.ac.uk/id/document/1092435> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/1092435> <http://www.w3.org/2000/01/rdf-schema#label> "Herschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/1092435> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092435> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092435> <http://eprints.org/relation/ismediumThumbnailVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092435> <http://eprints.org/ontology/hasFile> <https://discovery.ucl.ac.uk/id/eprint/10093774/10/medium.jpg> . <https://discovery.ucl.ac.uk/id/document/1092435> <http://purl.org/dc/terms/hasPart> <https://discovery.ucl.ac.uk/id/eprint/10093774/10/medium.jpg> . <https://discovery.ucl.ac.uk/id/eprint/10093774/10/medium.jpg> <http://www.w3.org/2000/01/rdf-schema#label> "medium.jpg"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/1092436> . <https://discovery.ucl.ac.uk/id/document/1092436> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/1092436> <http://www.w3.org/2000/01/rdf-schema#label> "Herschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/1092436> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092436> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092436> <http://eprints.org/relation/issmallThumbnailVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092436> <http://eprints.org/ontology/hasFile> <https://discovery.ucl.ac.uk/id/eprint/10093774/11/small.jpg> . <https://discovery.ucl.ac.uk/id/document/1092436> <http://purl.org/dc/terms/hasPart> <https://discovery.ucl.ac.uk/id/eprint/10093774/11/small.jpg> . <https://discovery.ucl.ac.uk/id/eprint/10093774/11/small.jpg> <http://www.w3.org/2000/01/rdf-schema#label> "small.jpg"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/1092442> . <https://discovery.ucl.ac.uk/id/document/1092442> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/1092442> <http://www.w3.org/2000/01/rdf-schema#label> "Herschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/1092442> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092442> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092442> <http://eprints.org/relation/isIndexCodesVersionOf> <https://discovery.ucl.ac.uk/id/document/1092432> . <https://discovery.ucl.ac.uk/id/document/1092442> <http://eprints.org/ontology/hasFile> <https://discovery.ucl.ac.uk/id/eprint/10093774/12/indexcodes.txt> . <https://discovery.ucl.ac.uk/id/document/1092442> <http://purl.org/dc/terms/hasPart> <https://discovery.ucl.ac.uk/id/eprint/10093774/12/indexcodes.txt> . <https://discovery.ucl.ac.uk/id/eprint/10093774/12/indexcodes.txt> <http://www.w3.org/2000/01/rdf-schema#label> "indexcodes.txt"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10093774> <http://www.w3.org/2000/01/rdf-schema#seeAlso> <https://discovery.ucl.ac.uk/id/eprint/10093774/> . <https://discovery.ucl.ac.uk/id/eprint/10093774/> <http://purl.org/dc/elements/1.1/title> "HTML Summary of #10093774 \n\nHerschel-PACS measurements of nitrogen enrichment in nebulae around Wolf–Rayet stars\n\n" . <https://discovery.ucl.ac.uk/id/eprint/10093774/> <http://purl.org/dc/elements/1.1/format> "text/html" . <https://discovery.ucl.ac.uk/id/eprint/10093774/> <http://xmlns.com/foaf/0.1/primaryTopic> <https://discovery.ucl.ac.uk/id/eprint/10093774> .