BASI
Bulletin of the Astronomical Society of India
Bulletin of the Astronomical Society of India
A. Tripathi1*, U. S. Pandey1† and Brijesh Kumar2‡
1Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009, India
2Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263129, India
Received: 02 April 2013 | Accepted: 23 September 2013
View Full Article: [PDF]
We present deep Johnson UBV and Cousins RI CCD photometry of three young open clusters, namely, NGC 2129, NGC 1502 and King 12 reaching down to V ∼ 22 mag. For the first time, we have reported optical CCD data for King 12. Fundamental parameters for these clusters have been determined by comparing colourcolour and colour-magnitude diagrams (CMDs) with the theoretical models. The cluster radii have been estimated to be 3.3, 1.7 and 3.9 pc for NGC 2129, NGC 1502 and King 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 be 2.1±0.1, 1.0±0.1 and 2.5±0.1 kpc respectively. The ages of the clusters have been obtained 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 all the three clusters. The analysis shows that there is differential interstellar reddening in the direction of all clusters.
 |
 |
 |
| Fig. 1 | Fig. 2 | Fig. 3 |
 |
 |
 |
| Fig. 4 | Fig. 5 | Fig. 6 |
 |
 |
 |
| Fig. 7 | Fig. 8 | Fig. 9 |
 |
 |
 |
| Fig. 10 | Fig. 11 | Fig. 12 |
 |
||
| Fig. 13 |
<< Previous Article | Next Article >>Back to September 2013
Keywords : Hertzsprung-Russell (HR) diagram – open clusters and associations: individual: NGC 2129, NGC 1502 and King 12