Star clusterings in the Carina complex: UBVRI photometry of Bochum 9, 10 and 11期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Star clusterings in the Carina complex: UBVRI photometry of Bochum 9, 10 and 11

Authors:	Ferdinando Patat Giovanni Carraro

Institution:	¹European Southern Observatory, Karl-Schwarzschild-Str 2, D-85748 Garching b. München, Germany;²Dipartimento di Astronomia, Universitádi Padova, Vicolo Osservatorio 3, I-35122 Padova, Italy

Abstract:	We report on the first UBVRI CCD photometry of three poorly known star clusterings in the region of η Carinae: Bochum 9, 10 and 11. We find that they are young, rather poor, loose open clusters. We argue that Bochum 9 is probably a small and loose open cluster with about 30 probable members having E ( B ? V )=0.63±0.08 , located 4.6 kpc far from the Sun, beyond the Carina spiral arm. Similarly, Bochum 10 is a sparse aggregate with 14 probable members having E ( B ? V )=0.47±0.05 and at a distance of 2.7 kpc from the Sun. Finally, Bochum 11 is a less than 4×10⁶ yr old cluster for which we identify 24 members. It has a reddening E ( B ? V )=0.58±0.05 , and lies between Bochum 10 and 9, at 3.5 kpc from the Sun. We propose that in the field of the cluster some stars might be pre-main-sequence candidates.

Keywords:	open clusters and associations: individual: Bochum 9 open clusters and associations: individual: Bochum 10 open clusters and associations: individual: Bochum 11