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The M 4 Core Project with HST -II. Multiple stellar populations at the bottom of the main sequence

Milone, Antonino; Marino, Anna; Bedin, L R; Piotto, G; Cassisi, S; Dieball, A; Anderson, Jay; Jerjen, Helmut; Asplund, Martin; Bellini, A; Brogaard, Karsten; Dotter, Aaron; Giersz, M; Heggie, D C; Knigge, C.; Buonanno, R

Description

The M 4 Core Project with HST is designed to exploit the Hubble Space Telescope (HST) to investigate the central regions of M 4, the Globular Cluster closest to the Sun. In this paper we combine optical and near-infrared photometry to study multiple stellar populations in M4.We detected two sequences of M-dwarfs containing ~38 per cent (MSI) and ~62 per cent (MSII) of MS stars below the main-sequence (MS) knee. We compare our observations with those of NGC 2808, which is the only other GCs...[Show more]

dc.contributor.authorMilone, Antonino
dc.contributor.authorMarino, Anna
dc.contributor.authorBedin, L R
dc.contributor.authorPiotto, G
dc.contributor.authorCassisi, S
dc.contributor.authorDieball, A
dc.contributor.authorAnderson, Jay
dc.contributor.authorJerjen, Helmut
dc.contributor.authorAsplund, Martin
dc.contributor.authorBellini, A
dc.contributor.authorBrogaard, Karsten
dc.contributor.authorDotter, Aaron
dc.contributor.authorGiersz, M
dc.contributor.authorHeggie, D C
dc.contributor.authorKnigge, C.
dc.contributor.authorBuonanno, R
dc.date.accessioned2015-12-10T23:34:53Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/69619
dc.description.abstractThe M 4 Core Project with HST is designed to exploit the Hubble Space Telescope (HST) to investigate the central regions of M 4, the Globular Cluster closest to the Sun. In this paper we combine optical and near-infrared photometry to study multiple stellar populations in M4.We detected two sequences of M-dwarfs containing ~38 per cent (MSI) and ~62 per cent (MSII) of MS stars below the main-sequence (MS) knee. We compare our observations with those of NGC 2808, which is the only other GCs where multiple MSs of very low-mass stars have been studied to date. We calculate synthetic spectra for M-dwarfs, assuming the chemical composition mixture inferred from spectroscopic studies of stellar populations along the red giant branch, and different helium abundances, and we compare predicted and observed colours. Observations are consistent with two populations, one with primordial abundance and another with enhanced nitrogen and depleted oxygen.
dc.publisherBlackwell Publishing Ltd
dc.rightsAuthor/s retain copyright
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleThe M 4 Core Project with HST -II. Multiple stellar populations at the bottom of the main sequence
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume439
dc.date.issued2014
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationU3488905xPUB2074
local.type.statusPublished Version
local.contributor.affiliationMilone, Antonino, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMarino, Anna, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBedin, L R, INAF-Osservatorio Astronomico di Padova
local.contributor.affiliationPiotto, G, Università di Padova
local.contributor.affiliationCassisi, S, INAF-Observatorio Astronomico di Collurania
local.contributor.affiliationDieball, A, University Southampton
local.contributor.affiliationAnderson, Jay, Space Telescope Science Institute
local.contributor.affiliationJerjen, Helmut, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationAsplund, Martin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBellini, A, Space Telescope Science Institute
local.contributor.affiliationBrogaard, Karsten, University of Victoria
local.contributor.affiliationDotter, Aaron, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGiersz, M, Polish Academy of Sciences
local.contributor.affiliationHeggie, D C, University of Edinburgh
local.contributor.affiliationKnigge, C., University Southampton
local.contributor.affiliationBuonanno, R, INAF – Osservatorio Astronomico di Collurania
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage1588
local.bibliographicCitation.lastpage1595
local.identifier.doi10.1093/mnras/stu030
dc.date.updated2015-12-10T11:36:59Z
local.identifier.scopusID2-s2.0-84897083280
local.identifier.thomsonID000334114000023
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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