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http://dx.doi.org/10.5303/JKAS.2006.39.4.115

NEAR-INFRARED PHOTOMETRIC STUDY OF THE GALACTIC OPEN CLUSTERS NGC 1641 AND NGC 2394 BASED ON 2MASS DATA  

Kim, Sang-Chul (Korea Astronomy and Space Science Institute)
Publication Information
Journal of The Korean Astronomical Society / v.39, no.4, 2006 , pp. 115-123 More about this Journal
Abstract
We present $JHK_S$ near-infrared CCD photometric study for the Galactic open clusters NGC 1641 and NGC 2394. These clusters have never been studied before, and we provide, for the first time the cluster parameters; reddening, distance, metallicity and age. NGC 1641 is an old open cluster with age $1.6{\pm}0.2$ Gyr, metallicity $[Fe/H]=0.0{\pm}0.2$ dex, distance modulus$(m-M)_0=10.4{\pm}0.3\;mag(d=1.2{\pm}02\;kpc)$, and reddening $E(B-V)=0.10{\pm}0.05$ mag. The parameters for the other old open cluster NGC 2394 are estimated to be $age=1.1{\pm}0.2$ Gyr, $[Fe/H]=0.0{\pm}0.2$ dex, $(m-M)_0=9.1{\pm}0.4\;mag(d=660{\pm}120\;pc)$, and $E(B-V)=0.05{\pm}0.10$ mag. The metallicities and distance values for these two old open clusters are consistent with the relation between the metallicities and the Galactocentric distances of other old open clusters. We find the metallicity gradient of 53 old open clusters including NGC 1641 and NGC 2394 to be ${\Delta}[Fe/H]/{\Delta}R_{gc}=-0.067{\pm}0.009\;dex\;kpc^{-1}$.
Keywords
open clusters and associations: individual(NGC 1641 and NGC 2394); Galaxy: disk; Galaxy: stellar content; Galaxy: structure; Hertzsprung-Russell diagram;
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