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dc.contributor.authorNegueruela, I
dc.contributor.authorMonguió, M
dc.contributor.authorMarco, A
dc.contributor.authorTabernero, HM
dc.contributor.authorGonzález-Fernández, C
dc.contributor.authorDorda, R
dc.date.accessioned2018-11-19T12:40:10Z
dc.date.available2018-11-19T12:40:10Z
dc.date.issued2018-07-01
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285410
dc.description.abstractThe heavily obscured open cluster Berkeley 51 shows characteristics typical of young massive clusters, even though the few previous studies have suggested older ages.We combine optical (UBV) and 2MASS photometry of the cluster field with multi-object and long-slit optical spectroscopy for a large sample of stars. We apply classical photometric analysis techniques to determine the reddening to the cluster, and then derive cluster parameters via isochrone fitting. We find a large population of B-type stars, with a main-sequence turn-off at B3V, as well as a large number of supergiants with spectral types ranging from F to M. We use intermediate-resolution spectra of the evolved cool stars to derive their stellar parameters and find an essentially solar iron abundance. Under the plausible assumption that our photometry reaches stars still close to the zero-age main sequence, the cluster is located at d ≈ 5.5 kpc and has an age of ~60 Ma, though a slightly younger and more distant cluster cannot be ruled out. Despite the apparent good fit of isochrones, evolved stars seem to reside in positions of the colour-magnitude diagram far away from the locations where stellar tracks predict helium burning to occur. Of particular interest is the presence of four yellow supergiants, two on the ascending branch and two others close to or inside the instability strip.
dc.publisherOxford University Press
dc.titleBerkeley 51, a young open cluster with four yellow supergiants
dc.typeArticle
prism.endingPage2990
prism.issueIdentifier3
prism.publicationDate2018
prism.publicationNameMonthly Notices of the Royal Astronomical Society
prism.startingPage2976
prism.volume477
dc.identifier.doi10.17863/CAM.32773
dcterms.dateAccepted2018-03-13
rioxxterms.versionofrecord10.1093/mnras/sty718
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-07-01
dc.identifier.eissn1365-2966
dc.publisher.urlhttp://dx.doi.org/10.1093/mnras/sty718
rioxxterms.typeJournal Article/Review
pubs.funder-project-idScience and Technology Facilities Council (ST/J00541X/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/N005805/1)
cam.issuedOnline2018-03-19


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