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Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets

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Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets

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Título Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets
Autor Bica, Eduardo Luiz Damiani
Bonatto, Charles Jose
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.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 530 (June 2011), A32, 11 p.
Assunto Aglomerados estelares
Dinamica estelar
Fotometria astronômica
[en] Galaxy: structure
[en] Open clusters and associations: general
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/99043
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