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The radial distribution of the two stellar populations in NGC 1851

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dc.contributor.authorMilone, Antonino
dc.contributor.authorStetson, Peter B
dc.contributor.authorPiotto, G
dc.contributor.authorBedin, L R
dc.contributor.authorAnderson, Jay
dc.contributor.authorCassisi, S
dc.contributor.authorSalaris, M
dc.date.accessioned2015-12-13T22:48:52Z
dc.date.issued2009
dc.date.updated2016-02-24T09:42:52Z
dc.description.abstractWe have analyzed ACS/WFC andWFPC2 images from HST, as well as ground-based data to study the radial distribution of the double sub-giant branch (SGB) recently discovered in the Galactic globular cluster NGC 1851. We found that the SGB split can be followed all the way from the cluster center out to at least 8′ from the center. Beyond this distance out to the tidal radius at ∼ 11.7 arcmin, there are simply too few SGB stars to identify the sequences. The number ratio of the bright SGB to the faint SGB stars shows no significant radial trend. Furthermore, we have found that the ratio of blue horizontal-branch (HB) stars plus RR Lyrae to the red HB stars also remains constant from the cluster center to the outer envelope.
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/80268
dc.publisherSpringer
dc.sourceAstronomy and Astrophysics
dc.subjectKeywords: Cluster centers; Globular clusters; Ground-based data; Radial distributions; Stars: Hertzsprung-russell and C-M diagrams; Stars: Population II; Stellar populations; Stars Stars: Hertzsprung-Russell (HR) and C-M diagrams; Stars: Population II
dc.titleThe radial distribution of the two stellar populations in NGC 1851
dc.typeJournal article
local.bibliographicCitation.issue3
local.bibliographicCitation.lastpage764
local.bibliographicCitation.startpage755
local.contributor.affiliationMilone, Antonino, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationStetson, Peter B, National Research Council of Canada
local.contributor.affiliationPiotto, G, Università di Padova
local.contributor.affiliationBedin, L R, Space Telescope Science Institute
local.contributor.affiliationAnderson, Jay, Space Telescope Science Institute
local.contributor.affiliationCassisi, S, INAF-Observatorio Astronomico di Collurania
local.contributor.affiliationSalaris, M, Liverpool John Moores University
local.contributor.authoruidMilone, Antonino, u5219567
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationf5625xPUB8549
local.identifier.citationvolume503
local.identifier.doi10.1051/0004-6361/200912256
local.identifier.scopusID2-s2.0-70649086735
local.type.statusPublished Version

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