Matches in SemOpenAlex for { <https://semopenalex.org/work/W179714998> ?p ?o ?g. }
Showing items 1 to 78 of
78
with 100 items per page.
- W179714998 abstract "Nitrogen is thought to have both primary and secondary origins depending on whether the seed carbon and oxygen are produced by the star itself (primary) or already present in the interstellar medium (secondary) from which star forms. DLA and sub-DLA systems with typical metallicities of -3.0<Z/Z_sun<-0.5 are excellent tools to study nitrogen production. We made a search for nitrogen in the ESO-UVES advanced data products (EUADP) database. In the EUADP database, we find 10 new measurements and 9 upper limits of nitrogen. We further compiled DLA/sub-DLA data from the literature with estimates available of nitrogen and alpha-elements. This yields a total of 98 systems, i.e. the largest nitrogen abundance sample investigated so far. In agreement with previous studies, we indeed find a bimodal [N/alpha] behaviour: three-quarter systems show a mean value of [N/alpha]=-0.87 with a scatter of 0.21 dex and one-quarter shows ratios clustered at [N/alpha]=-1.43 with a lower dispersion of 0.13 dex. The high [N/alpha] group is consistent with the blue compact dwarves and dwarf irregular galaxies, suggesting primary nitrogen production. The low [N/alpha] group is the lowest ever observed in any astrophysical site and probably provides an evidence of the primary production by fast rotating massive stars in young sites. Moreover, we find a transition between the two [N/alpha] groups around [N/H]=-2.5. The transition is not abrupt and there are a few systems lying in the transition region. Additional observations of DLAs/sub-DLAs below [N/H]<-2.5 would provide more clues." @default.
- W179714998 created "2016-06-24" @default.
- W179714998 creator A5031906583 @default.
- W179714998 creator A5034961467 @default.
- W179714998 creator A5044746772 @default.
- W179714998 creator A5047305963 @default.
- W179714998 creator A5073472347 @default.
- W179714998 creator A5081468149 @default.
- W179714998 date "2014-01-31" @default.
- W179714998 modified "2023-10-17" @default.
- W179714998 title "Nitrogen Abundances in Damped Ly-alpha Absorbers" @default.
- W179714998 hasPublicationYear "2014" @default.
- W179714998 type Work @default.
- W179714998 sameAs 179714998 @default.
- W179714998 citedByCount "0" @default.
- W179714998 crossrefType "posted-content" @default.
- W179714998 hasAuthorship W179714998A5031906583 @default.
- W179714998 hasAuthorship W179714998A5034961467 @default.
- W179714998 hasAuthorship W179714998A5044746772 @default.
- W179714998 hasAuthorship W179714998A5047305963 @default.
- W179714998 hasAuthorship W179714998A5073472347 @default.
- W179714998 hasAuthorship W179714998A5081468149 @default.
- W179714998 hasConcept C121332964 @default.
- W179714998 hasConcept C150846664 @default.
- W179714998 hasConcept C159110408 @default.
- W179714998 hasConcept C196939603 @default.
- W179714998 hasConcept C2775944032 @default.
- W179714998 hasConcept C44870925 @default.
- W179714998 hasConcept C49453240 @default.
- W179714998 hasConcept C505870484 @default.
- W179714998 hasConcept C537208039 @default.
- W179714998 hasConcept C62520636 @default.
- W179714998 hasConcept C64943373 @default.
- W179714998 hasConcept C71924100 @default.
- W179714998 hasConcept C77077793 @default.
- W179714998 hasConcept C86803240 @default.
- W179714998 hasConcept C98444146 @default.
- W179714998 hasConceptScore W179714998C121332964 @default.
- W179714998 hasConceptScore W179714998C150846664 @default.
- W179714998 hasConceptScore W179714998C159110408 @default.
- W179714998 hasConceptScore W179714998C196939603 @default.
- W179714998 hasConceptScore W179714998C2775944032 @default.
- W179714998 hasConceptScore W179714998C44870925 @default.
- W179714998 hasConceptScore W179714998C49453240 @default.
- W179714998 hasConceptScore W179714998C505870484 @default.
- W179714998 hasConceptScore W179714998C537208039 @default.
- W179714998 hasConceptScore W179714998C62520636 @default.
- W179714998 hasConceptScore W179714998C64943373 @default.
- W179714998 hasConceptScore W179714998C71924100 @default.
- W179714998 hasConceptScore W179714998C77077793 @default.
- W179714998 hasConceptScore W179714998C86803240 @default.
- W179714998 hasConceptScore W179714998C98444146 @default.
- W179714998 hasLocation W1797149981 @default.
- W179714998 hasOpenAccess W179714998 @default.
- W179714998 hasPrimaryLocation W1797149981 @default.
- W179714998 hasRelatedWork W1498334449 @default.
- W179714998 hasRelatedWork W1536198149 @default.
- W179714998 hasRelatedWork W1859068048 @default.
- W179714998 hasRelatedWork W1984596395 @default.
- W179714998 hasRelatedWork W2008991502 @default.
- W179714998 hasRelatedWork W2015798867 @default.
- W179714998 hasRelatedWork W2064235661 @default.
- W179714998 hasRelatedWork W2072433121 @default.
- W179714998 hasRelatedWork W2085689196 @default.
- W179714998 hasRelatedWork W2114087841 @default.
- W179714998 hasRelatedWork W2133416593 @default.
- W179714998 hasRelatedWork W2139594802 @default.
- W179714998 hasRelatedWork W2152671803 @default.
- W179714998 hasRelatedWork W2292980626 @default.
- W179714998 hasRelatedWork W3080567714 @default.
- W179714998 hasRelatedWork W3099137176 @default.
- W179714998 hasRelatedWork W3100786203 @default.
- W179714998 hasRelatedWork W3105376551 @default.
- W179714998 hasRelatedWork W3155524872 @default.
- W179714998 isParatext "false" @default.
- W179714998 isRetracted "false" @default.
- W179714998 magId "179714998" @default.
- W179714998 workType "article" @default.