CCD Washington photometry of four poorly studied open clusters in the two inner quadrants of the galactic plane
arXiv:1404.7712 · doi:10.1016/j.newast.2014.04.010
Abstract
Complementing our Washington photometric studies on Galactic open clusters (OCs), we now focus on four poorly studied OCs located in the first and fourth Galactic quadrants, namely BH 84, NGC 5381, BH 211 and Czernik 37. We have obtained CCD photometry in the Washington system and passbands down to 18.5 magnitudes for these four clusters. Their positions and sizes were determined using the stellar density radial profiles. We derived reddening, distance, age and metallicity of the clusters from extracted color-magnitude diagrams (CMDs), using theoretical isochrones computed for the Washington system. There are no previous photometric data in the optical band for BH 84, NGC 5381 and BH 211. The CMDs of the observed clusters show relatively well defined main sequences, except for Czernik 37, wherein significant differential reddening seems to be present. The red giant clump is clearly seen only in BH 211. For this cluster, we estimated the age in (1000) Myr, assuming a metallicity of = 0.019. BH 84 was found to be much older than it was previously believed, while NGC 5381 happened to be much younger than previously reported. The heliocentric distances to these clusters are found to range between 1.4 and 3.4 kpc. BH 84 appears to be located at the solar galactocentric distance, while NGC 5381, BH 211 and Czernik 37 are situated inside the solar ring.
arXiv comment30 pages, 9 figures, 10 tables
References in corpus (16)
- Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
- Young massive star clusters
- VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
- New catalogue of optically visible open clusters and candidates
- Database of Geneva stellar evolution tracks and isochrones for UBVRIJHKLL'M, HST-WFPC2, Geneva and Washington photometric systems
- Revisiting the population of Galactic open clusters
- On the Galactic Disk Metallicity Distribution from Open Clusters I. New Catalogues and Abundance Gradient
- New infrared star clusters in the southern Milky Way with 2MASS
- New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS
- Open clusters in dense fields: the importance of field-star decontamination for NGC5715, Lynga4, Lynga9, Trumpler23, Trumpler26 and Czernik37
- New galactic open cluster candidates from DSS and 2MASS imagery
- Mass functions and structure of the young open cluster NGC\,6611
- Standard Giant Branches in the Washington Photometric System
- A catalog of 120 NGC open star clusters
- Faint open clusters with 2MASS: BH 63, Lyngå2, Lyngå12 and King 20
- Photometry of neglected open clusters in the First and Fourth Galactic Quadrants