A comprehensive photometric study of dynamically evolved small van den Bergh–Hagen open clusters
We present results from Johnson U BV , Kron-Cousins RI and Washington CT 1 T 2photometries for seven van den Bergh-Hagen (vdBH) open clusters, namely, vdBH 1,10, 31, 72, 87, 92, and 118. The high-quality, multi-band photometric data sets wereused to trace the cluster stellar density radial profiles...
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | Argentina |
| Recursos: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/156197 |
| Acesso em linha: | http://hdl.handle.net/11336/156197 |
| Access Level: | acceso abierto |
| Palavra-chave: | cluster https://purl.org/becyt/ford/1.7 https://purl.org/becyt/ford/1 |
| Resumo: | We present results from Johnson U BV , Kron-Cousins RI and Washington CT 1 T 2photometries for seven van den Bergh-Hagen (vdBH) open clusters, namely, vdBH 1,10, 31, 72, 87, 92, and 118. The high-quality, multi-band photometric data sets wereused to trace the cluster stellar density radial profiles and to build colour-magnitudediagrams (CMDs) and colour-colour (CC) diagrams from which we estimated theirstructural parameters and fundamental astrophysical properties. The clusters in oursample cover a wide age range, from ∼ 60 Myr up to 2.8 Gyr, are of relatively smallsize (∼ 1 − 6 pc) and are placed at distances from the Sun which vary between 1.8 and6.3 kpc, respectively. We also estimated lower limits for the cluster present-day massesas well as half-mass relaxation times (t r ). The resulting values in combination with thestructural parameter values suggest that the studied clusters are in advanced stages oftheir internal dynamical evolution (age/t r ∼ 20 − 320), possibly in the typical phaseof those tidally filled with mass segregation in their core regions. Compared to openclusters in the solar neighbourhood, the seven vdBH clusters are within more massive(∼ 80 − 380M ⊙ ), with higher concentration parameter values (c ∼ 0.75−1.15) anddynamically evolved ones. |
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