A photometric investigation of the young open cluster Trumpler 15

Abstract

In this paper we present and analyze new CCD $UBVRI$ photometry down to $V\approx$21 in the region of the young open cluster Trumpler~15, located in the Carina spiral feature. The cluster is rather compact and has a core radius of about 2${}^{\prime }$, which translates in about 1 pc at the distance of the cluster. We provide the first CCD investigation and update its fundamental parameters. We identify 90 candidate photometric members on the base of the position in the color-color and color-magnitude diagrams. This sample allows us to obtain a distance of 2.4$\pm$0.3 kpc from the Sun and a reddening E$(B-V)$=0.52$\pm 0.07$. We confirm that the cluster is young, and fix a upper limit of 6 million yrs to its age . In addition, we draw the attention on the lower part of the Main Sequence (MS) suggesting that some stars can be in contracting phase and on a gap in the MS, that we show to be a real feature, the $B1-B5$ gap found in other young open clusters. We finally study in details the extinction toward Trumpler~15 concluding that it is normal and suggesting a value of 2.89$\pm$0.19 for the ratio of total to selective absorption $R_V$.\

11 pages, 13 eps figures, accepted for publication in MNRAS

References in corpus (4)

• Star clusterings in the Carina complex: UBVRI photometry of Bochum 9, 10 and 11
• Non-uniform extinction in young open star clusters
• Star clusters in the Carina complex: UBVRI photometry of NGC3114, Collinder228 and vdB-Hagen99
• Star clusterings in the Carina complex: UBVRI photometry of NGC 3324 and Loden 165

Cited by in corpus (12)

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• The star cluster Collinder 232 in the Carina complex and its relation to Trumpler 14/16
• Searching for spiral features in the outer Galactic disk. The field towards WR38 and WR38a
• NGC 2580 and NGC 2588: Two open clusters in the Third Galactic Quadrant
• A radial velocity survey of the Carina Nebula's O-type stars
• The Duration of Star Formation in Galactic Giant Molecular Clouds. I. The Great Nebula in Carina
• A study of the two northern open clusters NGC 1582 and NGC 1663
• The Young Open Cluster NGC 2129
• A photometric study of the young open cluster NGC 1220
• Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
• The open cluster NGC 6520 and the nearby dark molecular cloud Barnard 86