2MASS Near-IR Color-Magnitude Diagram of the Old Open Cluster King 11
Abstract
We study near-infrared properties of the old open cluster King 11, based on the 2MASS photometric data. We determine the location of the red giant clump(RGC) in the (K, J ‑ K) color-magnitude diagram and derive the distance modulus of King 11 to be (m ‑ M)0 = 12.50 ± 0.10 using the mean K magnitude of RGC. From the red giant branch slope ‑ [Fe/H] relation we obtain the metallicity of this cluster, [Fe/H] = ‑0.17 ± 0.07. The age and interstellar reddening of this cluster are estimated to be log t = 9.48 ± 0.05, E(B ‑ V) = 0.90 ± 0.03, by applying Padova isochrone fits to the data.
- Publication:
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Journal of Korean Astronomical Society
- Pub Date:
- February 2011
- DOI:
- 10.5303/JKAS.2011.44.1.033
- Bibcode:
- 2011JKAS...44...33K
- Keywords:
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- open clusters and associations: individual (King 11);
- Galaxy: stellar content