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dc.contributor.authorBica, Eduardo Luiz Damianipt_BR
dc.contributor.authorOrtolani, Sergiopt_BR
dc.contributor.authorBarbuy, Beatrizpt_BR
dc.date.accessioned2014-07-18T02:04:27Zpt_BR
dc.date.issued1994pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/98065pt_BR
dc.description.abstractWe have carried out U BV I and Gunn z CCD photometry and integrated spectroscopy in the range λλ3700-10 000 Å of NGC 6540, which was previously classified as an open cluster. The observations indicate that we are dealing with a globular cluster of metallicity [Fe/H] ≈ -1.0 with an extended blue horizontal branch but some stars are also present on the red side. We derive a reddening of E(B- V)= 0.60 ± 0.10 and a distance d = 3.5 kpc from the Sun. The cluster giant branch is very poorly populated like in some Palomar clusters; however it has a very concentrated nucleus. Bright giants, extended in the E-W direction, are outside the nucleus. Therefore the cluster has many characteristics in common with post core collapse clusters. A structural analysis by means of stellar isopleths reveals that the cluster is elongated in the N-S direction in the outer parts, whereas the inner contours are progressively twisted towards E-W.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and Astrophysics. Berlin. Vol. 283, no. 1 (Mar. 1994), p. 67-75pt_BR
dc.rightsOpen Accessen
dc.subjectAstrofisica extragalaticapt_BR
dc.subjectGlobular clusters: individual: NGC 6540en
dc.subjectHR diagramen
dc.subjectAglomerados globularespt_BR
dc.subjectAglomerado globular NGC 6540pt_BR
dc.subjectFotometriapt_BR
dc.subjectEvolucao estelarpt_BR
dc.titleThe globular cluster ngc 6540pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000254330pt_BR
dc.type.originEstrangeiropt_BR


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