Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets
dc.contributor.author | Bica, Eduardo Luiz Damiani | pt_BR |
dc.contributor.author | Bonatto, Charles Jose | pt_BR |
dc.date.accessioned | 2014-08-02T02:10:39Z | pt_BR |
dc.date.issued | 2011 | pt_BR |
dc.identifier.issn | 0004-6361 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/99043 | pt_BR |
dc.description.abstract | Context. Poorly-populated star clusters may have photometric and structural properties not much different from asterisms, to the point that, in some cases, widely-used databases present conflicting classifications. Aims. We investigate the nature of a sample of challenging targets that have been classified either as star clusters or asterisms in different studies. A few objects are studied for the first time. Methods. The analysis employs 2MASS photometry, field-star decontamination, to enhance the intrinsic colour–magnitude diagram (CMD) morphology, and colour-magnitude filters, for high contrast stellar radial density profiles (RDPs). Results. Based on properties derived from field-star decontaminated CMDs, and structural parameters from RDPs, we find that Pismis 12, IC 1434, Juchert 10, Ruprecht 30, NGC 3519, Herschel 1, Mayer 1, and Muzzio 1 are open clusters with ages within 5Myr−1.3Gyr. Ruprecht 129, 130, 140, and 146 are borderline cases, being rather poorly-populated, with evolutionary sequences and RDPs suggesting star clusters. Dolidze 39, BH 79, and Ruprecht 103, have CMDs and RDPs typical of asterisms. Conclusions. When a low stellar population is associated with a dense field contamination and/or important differential reddening, only a thin line separates star clusters and asterisms. These cases require specific analytical tools to establish their nature. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Astronomy and astrophysics. Les Ulis. Vol. 530 (June 2011), A32, 11 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Open clusters and associations: general | en |
dc.subject | Fotometria astronômica | pt_BR |
dc.subject | Aglomerados estelares | pt_BR |
dc.subject | Galaxy: structure | en |
dc.subject | Dinamica estelar | pt_BR |
dc.title | Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000898921 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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