Astronomy and Astrophysics, volume 418, 525-537 (2004/5-1)
The star cluster Collinder 232 in the Carina complex and its relation to Trumpler 14/16.
CARRARO G., ROMANIELLO M., VENTURA P. and PATAT F.
Abstract (from CDS):
In this paper we present and analyze new CCD UBVRI photometry down to V≃21 in the region of the young open cluster Collinder 232, located in the Carina spiral arm, and discuss its relationship to Trumpler 14 and Trumpler 16, the two most prominent young open clusters located in the core of NGC 3372 (the Carina Nebula). First of all we study the extinction pattern in the region. We find that the total to selective absorption ratio RV
differs from cluster to cluster, being 3.48±0.11, 4.16±0.07 and 3.73±0.01 for Trumpler 16, Trumpler 14 and Collinder 232, respectively. Then we derive individual reddenings and intrinsic colours and magnitudes using the method devised by Romaniello et al. (2002AJ....123..915R
). Ages, age spreads and distances are then estimated by comparing the Colour Magnitude Diagrams and the Hertzsprung-Russel diagram with post and pre-main sequence tracks and isochrones. We find that Trumpler 14 and Collinder 232 lie at the same distance from the Sun (about 2.5kpc), whereas Trumpler 16 lies much further out, at about 4kpc from the Sun. As for the age, we find that Trumpler 16 is older than both Trumpler 14 and Collinder 232. For all the clusters we indicate the existence of a significant age dispersion, whose precise value is hampered by our inability to properly distinguish members from non-members. We finally suggest that Collinder 232 is a physical aggregate and provide estimates of its basic parameters.
stars: Hertzsprung-Russell (HR) and C-M - Galaxy: open clusters and associations: individual: Trumpler 14
VizieR on-line data:
<Available at CDS (J/A+A/418/525): table1.dat table2.dat>
Table 5: Cl* Trumpler 14 CRV NN N=10 among (Nos 7-42). Table 6: Cl* Collinder 232 CRV N N=3, (Nos 1, 2, 6). Table 7: Cl* Trumpler 16 CRV NN N=14 among (Nos 2-25).
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