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The double subgiant branch of NGC 1851: The role of the CNO abundance

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dc.contributor.authorCassisi, S
dc.contributor.authorSalaris, M
dc.contributor.authorPietrinferni, A
dc.contributor.authorPiotto, G
dc.contributor.authorMilone, Antonino
dc.contributor.authorBedin, L R
dc.contributor.authorAnderson, J
dc.date.accessioned2015-12-13T22:54:58Z
dc.date.issued2008
dc.date.updated2015-12-11T11:07:22Z
dc.description.abstractWe explore the possibility that the anomalous split in the subgiant branch (SGB) of the Galactic globular cluster NGC 1851 is due to the presence of two distinct stellar populations with very different initial metal mixtures: a normal a-enhanced component, and one characterized by strong anticorrelations among the CNONa abundances, with a total CNO abundance increased by a factor of 2. We test this hypothesis taking into account various empirical constraints, and conclude that the two populations should be approximately coeval, with the same initial He content. More high-resolution spectroscopic measurements of heavy elements-and in particular of the CNO sum-for this cluster are necessary to prove (or disprove) this scenario.
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/82333
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Abundances -stars; Evolution; Globular clusters; Individual (ngc 1851) -hertzsprung-russell diagram stars
dc.titleThe double subgiant branch of NGC 1851: The role of the CNO abundance
dc.typeJournal article
local.bibliographicCitation.issue2 (PART 2)
local.bibliographicCitation.lastpageL118
local.bibliographicCitation.startpageL115
local.contributor.affiliationCassisi, S, INAF-Observatorio Astronomico di Collurania
local.contributor.affiliationSalaris, M, Liverpool John Moores University
local.contributor.affiliationPietrinferni, A, INAF-Observatorio Astronomico di Collurania
local.contributor.affiliationPiotto, G, Università di Padova
local.contributor.affiliationMilone, Antonino, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBedin, L R, Space Telescope Science Institute
local.contributor.affiliationAnderson, J, Rice University
local.contributor.authoruidMilone, Antonino, u5219567
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationf5625xPUB10594
local.identifier.citationvolume672
local.identifier.doi10.1086/527035
local.identifier.scopusID2-s2.0-53449086693
local.type.statusPublished Version

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