Mostrar registro simples

dc.contributor.authorOrtolani, Sergiopt_BR
dc.contributor.authorBarbuy, Beatrizpt_BR
dc.contributor.authorBica, Eduardo Luiz Damianipt_BR
dc.date.accessioned2014-07-18T02:04:08Zpt_BR
dc.date.issued1990pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/98030pt_BR
dc.description.abstractWe present BVRI CCD-photometry of about 15000 stars in the possibly super-metal-rich globular cluster NGC 6553. The photometry extends to V = 21.5 reaching the cluster turn-off region. In the V vs. (V-I) diagram the red giant branch forms an arc, where the red tip is as faint as the horizontal branch, due to blanketing effects which are particularly strong in the highmetallicity late-type stars Depending on the amount ofblanketing in the spectral region and the combination of filters, the tip of the giant branch turns back towards the blue in certain colours like (B - V). Such distributions in the colour-magnitude diagrams (CMD) might be misleadingly interpreted in terms of a scatter in metallicity. The horizontal branch (HB) is so extremely red that it partially overlaps the red giant branch (RGB). The shape of the RGB and the relative positions ofthe RGB and the HB differ significantly from those of globular clusters usually called metal-rich as, for example, 47 Tuc. Using as age criterion the magnitude difference between the turn-off and the HB, we have estimated that the age of NGC 6553 should be slightly below that of classical globular clusters.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and Astrophysics. Berlin. Vol. 236, no. 2 (Sept. 1990), p. 362-370pt_BR
dc.rightsOpen Accessen
dc.subjectGlobular clustersen
dc.subjectAstrofísicapt_BR
dc.subjectAglomerados globularespt_BR
dc.subjectHigh metallicityen
dc.subjectColour-magnitude diagramsen
dc.subjectFotometriapt_BR
dc.titleHigh-metallicity effects in BVRI colour-magnitude diagrams : the globular cluster NGC 6553pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000015334pt_BR
dc.type.originEstrangeiropt_BR


Thumbnail
   

Este item está licenciado na Creative Commons License

Mostrar registro simples