CCD UBVRI photometry of NGC 6811

Abstract

We present the results of CCD UBVRI observations of the open cluster NGC 6811 obtained on 18th July 2012 with the 1m telescope at the TÜBİTAK National Observatory (TUG). Using these photometric results, we determine the structural and astrophysical parameters of the cluster. The mean photometric uncertainties are better than 0.02 mag in the V magnitude and B-V, V-R, and V-I colour indices to about 0.03 mag for U-B among stars brighter than magnitude V=18. Cluster member stars were separated from the field stars using the Galaxia model of Sharma et al. (2011) together with other techniques. The core radius of the cluster is found to be $r_c$=3.60 arcmin. The astrophysical parameters were determined simultaneously via Bayesian statistics using the colour-magnitude diagrams V versus B-V, V versus V-I, V versus V-R, and V versus R-I of the cluster. The resulting most likely parameters were further confirmed using independent methods, removing any possible degeneracies. The colour excess, distance modulus, metallicity and the age of the cluster are determined simultaneously as E(B-V)=0.05$\pm$0.01 mag, $\mu =10.06\pm 0.08$ mag, [M/H]=-0.10$\pm$0.01 dex and t=1.00$\pm$0.05 Gyr, respectively. Distances of five red clump stars which were found to be members of the cluster further confirm our distance estimation.

22 pages, 13 figures and 9 tables, accepted for publication in Astrophysics and Space Science

References in corpus (4)

• Sejong Open Cluster Survey (SOS). 0. Target Selection and Data Analysis
• Baade-Wesselink distances and the effect of metallicity in classical cepheids
• First identification and absolute magnitudes of the red clump stars in the Solar neighbourhood for WISE
• Local stellar kinematics from RAVE data: IV. Solar neighbourhood age-metallicity relation

Cited by in corpus (15)

• Weakened magnetic braking as the origin of anomalously rapid rotation in old field stars
• The Age and Distance of the Kepler Open Cluster NGC 6811 from an Eclipsing Binary, Turnoff Star Pulsation, and Giant Asteroseismology
• The [Y/Mg] clock works for evolved solar metallicity stars
• A comprehensive study of the open cluster NGC 6866
• CCD UBV photometry of the open cluster NGC 6819
• 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
• CCD UBV photometric study of five open clusters - Dolidze 36, NGC 6728, NGC 6800, NGC 7209 and Platais 1
• CCD UBV Photometry and Kinematics of the Open Cluster NGC 225
• 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
• A Study of Open Clusters Frolov 1 and NGC 7510 using CCD UBV Photometry and Gaia DR2 Astrometry
• Metallicity and absolute magnitude calibrations for F-G type main-sequence stars in the Gaia era
• Exploration about the origin of galactic and extragalactic star clusters through simulated H-R diagrams