Star clusterings in the Carina complex: UBVRI photometry of Bochum 9, 10 and 11 |
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Authors: | Ferdinando Patat Giovanni Carraro |
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Affiliation: | 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 |
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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. |
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Keywords: | open clusters and associations: individual: Bochum 9 open clusters and associations: individual: Bochum 10 open clusters and associations: individual: Bochum 11 |
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