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Author Kumar, Brijesh ♦ Pandey, U.S. ♦ Tripathi, A.
Source Aryabhatta Research Institute of Observational Sciences (ARIES)
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Hertzsprung-Russell
Abstract We present deep Johnson UBV and Cousins RI CCD photometry of threeyoung open clusters, namely, NGC 2129, NGC 1502 and King 12 reaching down toV 22 mag. For the first time, we have reported optical CCD data for King 12. Fundamentalparameters for these clusters have been determined by comparing colourcolourand colour-magnitude diagrams (CMDs) with the theoretical models. The clusterradii have been estimated to be 3.3, 1.7 and 3.9 pc for NGC 2129, NGC 1502 andKing 12 respectively. The reddenings E(B-V) have been determined to be 0.77 0.05,0.68 0.05 and 0.63 0.05 while the corresponding distances have been found to be2.1 0.1, 1.0 0.1 and 2.5 0.1 kpc respectively. The ages of the clusters have beenobtained after fitting theoretical stellar evolutionary models for solar metallicity Z =0.019 isochrones with the observed CMDs. This gives an age of 10.0 0.1 Myr for allthe three clusters. The analysis shows that there is di erential interstellar reddening inthe direction of all clusters.
Part of series BASI vol 41
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Institution AASI