A photometric investigation of the young open cluster trumpler 15

Dec, 2001
11 pages
Published in:
  • Mon.Not.Roy.Astron.Soc. 331 (2002) 785
e-Print:

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Abstract: (arXiv)
In this paper we present and analyze new CCD UBVRIUBVRI photometry down to VV\approx21 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±\pm0.3 kpc from the Sun and a reddening E(BV)(B-V)=0.52±0.07\pm0.07. 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 B1B5B1-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±\pm0.19 for the ratio of total to selective absorption RVR_V.\