Issue |
A&A
Volume 418, Number 2, May I 2004
|
|
---|---|---|
Page(s) | 525 - 537 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20034335 | |
Published online | 09 April 2004 |
The star cluster Collinder 232 in the Carina complex and its relation to Trumpler 14/16 *,**
1
Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, 35122, Padova, Italy
2
European Southern Observatory, Karl-Schwarzschild-Str 2, 85748 Garching b. München, Germany
3
Osservatorio Astronomico di Roma, Via di Frascati 33, 00040, Monte Porzio Catone, Italy
Corresponding author: G. Carraro, giovanni.carraro@unipd.it
Received:
17
September
2003
Accepted:
7
January
2004
In this paper we present and analyze new CCD UBVRI photometry down
to 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
,
and
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. ([CITE]). 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 2.5 kpc), whereas Trumpler 16 lies much further out, at
about 4 kpc 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.
Key words: stars: Hertzsprung-Russell (HR) and C-M / Galaxy: open clusters and associations: individual: Trumpler 14
© ESO, 2004
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