Near-Infrared Photometric Study of the Old Open Cluster Trumpler 5
Abstract
We present JHK near-infrared photometric study for the old open cluster (OC) Trumpler 5 (Tr 5), based on the 2MASS data. From the color-magnitude diagrams of Tr 5, we have located the position of the red giant clump (RGC) stars, and used the mean magnitude of the RGC stars in K-band to estimate the distance to Tr 5, d = 3.1 +/- 0.1 kpc ((m-M)_0 = 12.46 +/- 0.04). From fitting the theoretical isochrones of Padova group, we have estimated the reddening, metallicity, and age : E(B-V) = 0.64 +/- 0.05, [Fe/H] = -0.4 +/- 0.1 dex, and t =2.8 +/- 0.2 Gyr (log t=9.45 +/- 0.04), respectively. These parameters generally agree well with those obtained from the previous studies on Tr 5 and confirms that this cluster is an old OC with metallicity being metal-poorer than solar abundance, located in the anti-Galactic center region.
- Publication:
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Journal of Korean Astronomical Society
- Pub Date:
- December 2009
- DOI:
- 10.5303/JKAS.2009.42.6.135
- arXiv:
- arXiv:0912.4588
- Bibcode:
- 2009JKAS...42..135K
- Keywords:
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- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- JKAS (J. of the Korean Astron. Soc.) in press (2009 Dec issue), page numbers will be changed