Near-Infrared Photometric Study of the Old Open Cluster Trumpler 5

Details Near-Infrared Photometric Study of the Old Open Cluster Trumpler 5 Near-Infrared Photometric Study of the Old Open Cluster Trumpler 5

2009-12-23

arxiv.org/abs/0912.4588v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

JKAS (J. of the Korean Astron. Soc.) in press (2009 Dec issue), page numbers will be changed

Scientific paper

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.

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