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dc.contributor.authorPiatti, Andres E.pt_BR
dc.contributor.authorClaria Olmedo, Juan Josept_BR
dc.contributor.authorBica, Eduardo Luiz Damianipt_BR
dc.contributor.authorGeisler, Dougpt_BR
dc.contributor.authorMinniti, Dantept_BR
dc.date.accessioned2014-12-04T02:13:48Zpt_BR
dc.date.issued1998pt_BR
dc.identifier.issn0004-6256pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/107738pt_BR
dc.description.abstractCCD observations in the B, V , and I passbands have been used to generate color-magnitude diagrams (CMDs) for the southern open cluster candidates Pismis 18, Pismis 19, and NGC 6005, as well as for the old open cluster NGC 6253. The sample consists of about 1550 stars reaching down to V ~ 19 mag. From analysis of the CMDs, the physical reality of the three cluster candidates is conÐrmed and their reddening, distance, and age are derived, as well as those of NGC 6253. In addition, integrated spectra for Pismis 18, Pismis 19, and NGC 6253 covering a range from 3500 to 9200 ÅŽ were obtained. The reddening, age, and metallicity of these three clusters were derived from Balmer and Ca II triplet equivalent widths by comparing the observed spectra with those of template clusters. The photometric and spectroscopic results allow us to conclude that Pismis 18, Pismis 19, and NGC 6005 are intermediate-age (t≈1 Gyr), genuine open clusters, while NGC 6253 has an age t≈5 Gyr. All these clusters are located approximately toward the Galactic center, between 1.5 and 2.7 kpc from the Sun. Their metallicities range over values that are typical of moderately metal-poor to moderately metal-rich open clusters.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe Astronomical Journal. New York. Vol. 116, no. 2 (Aug. 1998), p. 801-812pt_BR
dc.rightsOpen Accessen
dc.subjectGalaxies : star clustersen
dc.subjectAstrofisica extragalaticapt_BR
dc.subjectOpen clusters and associations : individual (Pismis 18, Pismis 19, NGC 6005, NGC 6253)en
dc.subjectFotometriapt_BR
dc.subjectEspectroscopiapt_BR
dc.subjectAglomerados globularespt_BR
dc.subjectAglomerado globular NGC 6005pt_BR
dc.subjectAglomerado globular NGC 6253pt_BR
dc.subjectEstrelas gigantespt_BR
dc.titleA photometric and spectroscopic study of the southern open clusters Pismis 18, Pismis 19, NGC 6005, and NGC 6253pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000226179pt_BR
dc.type.originEstrangeiropt_BR


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