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dc.contributor.author
Cacciari, Carla
dc.contributor.author
Pasquini, L.
dc.contributor.author
Valenti, E.
dc.contributor.author
Käufl, H. U.
dc.contributor.author
Mauas, Pablo Jacobo David
dc.date.available
2017-05-19T21:53:43Z
dc.date.issued
2015-01
dc.identifier.citation
Cacciari, Carla; Pasquini, L.; Valenti, E.; Käufl, H. U.; Mauas, Pablo Jacobo David; Helium abundance difference within globular clusters: NGC 2808; Societa Astronomica Italiana; Memorie della Società Astronomica Italiana; 86; 1-2015; 207-210
dc.identifier.issn
1824-016X
dc.identifier.uri
http://hdl.handle.net/11336/16803
dc.description.abstract
Multiple populations have been recently detected in most Galactic globular clusters,
even with no significant spread in metallicity. Unusual features of the observed colourmagnitude diagrams can be explained by differences in the He content of the stars belonging to the sub-populations. We report on empirical evidence of He abundance spread in a few globular clusters, with particular attention to NGC 2808, where He abundance variation has been measured in a pair of otherwise identical red giant stars using the HeI 1083 nm line.A quantitative estimate of this difference has been derived by appropriate chromospheric modelling, in very good agreement with stellar evolution requirements.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Societa Astronomica Italiana
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Stars: Abundances
dc.subject
Stars: Atmospheres
dc.subject
Globular Clusters: Individual: Ngc 2808
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Helium abundance difference within globular clusters: NGC 2808
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-18T15:36:53Z
dc.identifier.eissn
0037-8720
dc.journal.volume
86
dc.journal.pagination
207-210
dc.journal.pais
Italia
dc.journal.ciudad
Trieste
dc.description.fil
Fil: Cacciari, C.. INAF, Observatorio Astronomico di Bologna; Italia
dc.description.fil
Fil: Pasquini, L.. ESO; Alemania
dc.description.fil
Fil: Valenti, E.. ESO; Alemania
dc.description.fil
Fil: Käufl, H. U.. ESO; Alemania
dc.description.fil
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.journal.title
Memorie della Società Astronomica Italiana
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://sait.oat.ts.astro.it/MSAIt860215/PDF/2015MmSAI..86..207C.pdf
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://sait.oat.ts.astro.it/ToC.htm#2015
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