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dc.contributor.authorBica, Eduardo Luiz Damianipt_BR
dc.contributor.authorBonatto, Charles Josept_BR
dc.contributor.authorDutra, Carlos Maximilianopt_BR
dc.date.accessioned2014-07-31T02:05:15Zpt_BR
dc.date.issued2008pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/98994pt_BR
dc.description.abstractContext. Usually, a loose stellar distribution can be classified as an OB stellar group, an association, or a young open cluster. We compare data with the typical OB association Vul OB1. Aims. Here, we discuss the nature of Bochum 1, a typical example of an object affected by the above classification problem. Methods. Field-decontaminated 2MASS photometry is used to analyse colour–magnitude diagrams (CMDs) and stellar radial density profiles (RDPs) of the structures present in the region of Bochum 1. Results. The field-decontaminated CMD of Bochum 1 shows main sequence (MS) and pre-main sequence (PMS) stars. We report two new small angular-size, compact young clusters and one embedded cluster in the area of Bochum 1. Vul OB1 harbours the young open cluster NGC 6823 and the very compact embedded cluster Cr 404. The Vul OB1 association includes the HII region Sh2-86, and its stellar content is younger (≈3 Myr) than that of Bochum 1 (≈9 Myr), which shows no gas emission. Bochum 1 harbours one of the newly found compact clusters as its core. The RDP of Bochum 1 is irregular and cannot be fitted by a King-like profile, which suggests significant erosion or dispersion of stars from a primordial cluster. Similarly to Bochum 1, the decontaminated CMD of NGC 6823 presents conspicuous MS and PMS sequences. Taken separately, RDPs of MS and PMS stars follow a King-like profile. The core shows an excess density of MS stars that mimics the profile of a post-core collapse cluster. At such a young age, it can be explained by an excess of stars formed in the prominent core. Conclusions. The present study suggests that Bochum 1 is a star cluster fossil remain that might be dynamically evolving into an OB association. Bochum 1 may be a missing link connecting early star cluster dissolution with the formation of low-mass OB associations.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and astrophysics. Les Ulis. Vol. 489, no. 3 (Oct. 2008), p. 1129-1140pt_BR
dc.rightsOpen Accessen
dc.subjectOpen clusters and associations: generalen
dc.subjectAglomerados abertos e associaçõespt_BR
dc.subjectAglomerados estelarespt_BR
dc.subjectGalaxy: structureen
dc.subjectGalaxiapt_BR
dc.subjectEstruturas galaticaspt_BR
dc.titleInvestigating the boderline between a young star cluster and a small stellar association : a test case with Bochum 1pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000674238pt_BR
dc.type.originEstrangeiropt_BR


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