2009/12/23 by Sang-Chul Kim, Sang Chul Kim, Jaemann Kyeong +2
Physics and Astronomy · #Astronomy and Astrophysical Research #Cluster (spacecraft) #Hertzsprung–Russell diagram #Magnitude (astronomy) #Metallicity #Open cluster #Red clump #Red giant #Scientific Research and Discoveries #Stars #Stellar, planetary, and galactic studies #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.5303/jkas.2009.42.6.135
JKAS (J. of the Korean Astron. Soc.) in press (2009 Dec issue), page numbers will be changed
arxiv created 2009/12/23 · openalex publication_date 2009/12/31 · arxiv updated 2015/05/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 = <TEX>3.1±0.1</TEX> kpc (<TEX>(m-M)0</TEX> = <TEX>12.46±0.04</TEX>). From fitting the theoretical isochrones of Padova group, we have estimated the reddening, metallicity, and age : E(B-V) = <TEX>0.64±0:05</TEX>, [Fe/H] = <TEX>-0.4±0.1</TEX> dex, and t = <TEX>2.8±0.2</TEX> Gyr (log t = <TEX>9.45±0.04</TEX>), 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.