EDP Sciences
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Volume 379, Number 1, November III 2001
Page(s) 136 - 146
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20011314

A&A 379, 136-146 (2001)
DOI: 10.1051/0004-6361:20011314

Star clusters in the Carina complex: $\vec{UBVRI}$ photometry of NGC 3114, Collinder 228 and vdB-Hagen 99

G. Carraro1, 2 and F. Patat2

1  Dipartimento di Astronomia, Universitá di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy
2  European Southern Observatory, Karl-Schwartzschild-Str 2, 85748 Garching b. München, Germany

(Received 15 December 2000 / Accepted 11 September 2001)

In this paper we present and analyze CCD UBVRI photometry in the region of the three young open clusters NGC 3114, Collinder 228, and vdB-Hagen 99, located in the Carina spiral feature. NGC 3114 lies in the outskirts of the Carina nebula. We found 7 star members in a severely contaminated field, and obtain a distance of 950 pc and an age less than $3 \times 10^{8}$ yrs. Collinder 228 is a younger cluster (8 $\times 10^{6}$ yrs), located in front of the Carina nebula complex, for which we identify 11 new members and suggest that 30% of the stars are probably binaries. As for vdB-Hagen 99, we add 4 new members, confirming that it is a nearby cluster located at 500 pc from the Sun and projected toward the direction of the Carina spiral arm.

Key words: stars: evolution -- stars: general -- stars: Hertzsprung-Russel (HR) and C-M diagrams -- open clusters and associations: NGC 3114: individual -- open clusters and associations: Collinder 228: individual -- open clusters and associations: vdB-Hagen 99: individual

Offprint request: G. Carraro, giovanni.carraro@unipd.it

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