• DOI:10.1093/mnras/stt1939
• Corpus ID: 10775416

Photometric study of the open cluster – II. Stellar population and dynamical evolution in NGC 559

@article{Joshi2013PhotometricSO,
  title={Photometric study of the open cluster – II. Stellar population and dynamical evolution in NGC 559},
  author={Yogesh C. Joshi and Luis A. Balona and Santosh Joshi and Brijesh Kumar},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2013},
  volume={437},
  pages={804-815}
}

• Y. Joshi, L. Balona, +1 author B. Kumar
• Published 8 October 2013
• Physics
• Monthly Notices of the Royal Astronomical Society

ABSTRACT We present UBVRI photometry of stars in the field of the intermediate-age opencluster NGC559. By determining the stellar membership probabilities derived througha photometric and kinematic study of the cluster, we identify the 22 most probablecluster members. These areused to obtain robust cluster parameters. The mean propermotion of the cluster is µ x = −3.29±0.35, µ y = −1.24 ±0.28 mas yr −1 . The radialdistribution of the stellar surface density gives a cluster radius of 4 ′ .5±0 ′ .2 (3.2±0.2pc). By fitting solar metallicity stellar isochrones to the colour-colour and colour-magnitude diagrams, we find a uniform cluster reddening of E(B −V) = 0.82±0.02.The cluster has an age of 224±25Myr and is at a distance of 2.43±0.23kpc. Fromthe optical and near-infrared two-colour diagrams, we obtain colour excesses in thedirection of the cluster E(V −K) = 2.14 ±0.02, E(J −K) = 0.37 ±0.01, andE(B −V ) = 0.76±0.04. A total-to-selective extinction of R V = 3.5±0.1 is found inthe direction of the cluster which is marginallyhigher than the normalvalue. We derivethe luminosity function and the mass function for the cluster main sequence. The massfunction slope is found to be −2.12 ±0.31. We find evidence of mass segregation inthis dynamically relaxed cluster.Key words: open cluster:individual:NGC559–stars: formation – stars: luminosityfunction, mass function–techniques:photometric