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Multiple stellar populations in magellanic cloud clusters - III. The first evidence of an extended main sequence turn-offin a young cluster: NGC 1856

Milone, Antonino; Bedin, L R; Piotto, G; Marino, Anna; Cassisi, S; Bellini, A; Jerjen, Helmut; Pietrinferni, A; Aparicio, A; Rich, R M

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Recent studies have shown that the extended main-sequence turn-off(eMSTO) is a common feature of intermediate-age star clusters in the Magellanic Clouds (MCs). The most simple explanation is that these stellar systems harbour multiple generations of stars with an age difference of a few hundred million years. However, while an eMSTO has been detected in a large number of clusters with ages between ~ 1-2 Gyr, several studies of young clusters in both MCs and in nearby galaxies do not find any...[Show more]

dc.contributor.authorMilone, Antonino
dc.contributor.authorBedin, L R
dc.contributor.authorPiotto, G
dc.contributor.authorMarino, Anna
dc.contributor.authorCassisi, S
dc.contributor.authorBellini, A
dc.contributor.authorJerjen, Helmut
dc.contributor.authorPietrinferni, A
dc.contributor.authorAparicio, A
dc.contributor.authorRich, R M
dc.date.accessioned2016-02-24T22:40:54Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/98491
dc.description.abstractRecent studies have shown that the extended main-sequence turn-off(eMSTO) is a common feature of intermediate-age star clusters in the Magellanic Clouds (MCs). The most simple explanation is that these stellar systems harbour multiple generations of stars with an age difference of a few hundred million years. However, while an eMSTO has been detected in a large number of clusters with ages between ~ 1-2 Gyr, several studies of young clusters in both MCs and in nearby galaxies do not find any evidence for a prolonged star formation history, i. e. for multiple stellar generations. These results have suggested alternative interpretation of the eMSTOs observed in intermediate-age star clusters. The eMSTO could be due to stellar rotationmimicking an age spread or to interacting binaries. In these scenarios, intermediate-age MC clusters would be simple stellar populations, in close analogy with younger clusters. Here, we provide the first evidence for an eMSTO in a young stellar cluster. We exploit multiband Hubble Space Telescope photometry to study the ~ 300-Myr old star cluster NGC 1856 in the Large Magellanic Cloud and detected a broadened MSTO that is consistent with a prolonged star formation which had a duration of about 150 Myr. Below the turn-off, the main sequence (MS) of NGC 1856 is split into a red and blue component, hosting 33 ± 5 and 67 ± 5 per cent of the total number of MS stars, respectively. We discuss these findings in the context of multiple-stellar-generation, stellar-rotation, and interacting-binary hypotheses.
dc.publisherBlackwell Publishing Ltd
dc.rightsAuthor/s retain copyright
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleMultiple stellar populations in magellanic cloud clusters - III. The first evidence of an extended main sequence turn-offin a young cluster: NGC 1856
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume450
dc.date.issued2015
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationU3488905xPUB5580
local.type.statusPublished Version
local.contributor.affiliationMilone, Antonino, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBedin, L R, INAF-Osservatorio Astronomico di Padova
local.contributor.affiliationPiotto, G, Dipartimento di Astronomia
local.contributor.affiliationMarino, Anna, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationCassisi, S, Instituto Nazionale di Astrofisica Osservatorio Astronomico di Teramo
local.contributor.affiliationBellini, A, Space Telescope Science Institute
local.contributor.affiliationJerjen, Helmut, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationPietrinferni, A, INAF - Osservatorio Astronomico di Teramo
local.contributor.affiliationAparicio, A, Instituto de Astrofìsica de Canarias
local.contributor.affiliationRich, R M, University of California
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage3750
local.bibliographicCitation.lastpage3764
local.identifier.doi10.1093/mnras/stv829
dc.date.updated2016-02-24T10:07:46Z
local.identifier.scopusID2-s2.0-84938096444
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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