CCD UBV Photometry and Kinematics of the Open Cluster NGC 225

Abstract

We present the results of CCD $UBV$ photometric and spectroscopic observations of the open cluster NGC 225. In order to determine the structural parameters of NGC 225, we calculated the stellar density profile in the cluster's field. We estimated the probabilities of the stars being physical members of the cluster using the existing astrometric data. The most likely members of the cluster were used in the determination of the astrophysical parameters of the cluster. We calculated the mean radial velocity of the cluster as $V_r=-8.3\pm 5.0$ km s${}^{-1}$ from the optical spectra of eight stars in the cluster's field. Using the U-B vs B-V two-colour diagram and UV excesses of the F-G type main-sequence stars, the reddening and metallicity of NGC 225 were inferred as $E(B-V)=0.151\pm 0.047$ mag and $[Fe/H]=-0.11\pm 0.01$ dex, respectively. We fitted the colour-magnitude diagrams of NGC 225 with the PARSEC isochrones and derived the distance modulus, distance and age of the cluster as ${\mu }_V=9.3\pm 0.07$ mag, d=585$\pm$20 pc and $t=900\pm 100$ Myr, respectively. We also estimated the galactic orbital parameters and space velocity components of the cluster and found that the cluster has a slightly eccentric orbit of $e=0.07\pm 0.01$ and an orbital period of $P_{orb}=255\pm 5$ Myr.

34 pages, 13 figures and 7 tables, accepted for publication in Advances in Space Research. arXiv admin note: text overlap with arXiv:1603.00474, arXiv:1507.05968

References in corpus (4)

• Improving PARSEC models for very low mass stars
• New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
• The orbits of open clusters in the Galaxy
• Accuracy of Star Cluster Parameters from Integrated UBVRIJHK Photometry

Cited by in corpus (7)

• An investigation of open clusters Berkeley 68 and Stock 20 using CCD UBV and Gaia DR3 data
• CCD UBV photometric and Gaia astrometric study of eight open clusters- ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1 and Stock 21
• A study of the NGC 1193 and NGC 1798 open clusters using CCD UBV photometric and Gaia EDR3 data
• A photometric and astrometric study of the open clusters NGC 1664 and NGC 6939
• A study of the Czernik 2 and NGC 7654 open clusters using CCD UBV photometric and Gaia EDR3 data
• The young Galactic cluster NGC 225: binary stars content and total mass estimate
• Metallicity and absolute magnitude calibrations for F-G type main-sequence stars in the Gaia era