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@article{1231952,
author = {Yontan, T. and Bilir, S. and Bostanci, Z.F. and Ak, T. and Karaali, S. and Guver, T. and Ak, S. and Duran, S. and Paunzen, Ernst},
article_location = {DORDRECHT},
article_number = {2},
doi = {http://dx.doi.org/10.1007/s10509-014-2175-5},
keywords = {Galaxy: open cluster and associations: individual: NGC 6811; Stars: Hertzsprung Russell (HR) diagram},
language = {eng},
issn = {0004-640X},
journal = {Astrophysics and Space Science},
title = {CCD UBVRI photometry of NGC 6811},
volume = {355},
year = {2015}
}
TY - JOUR
ID - 1231952
AU - Yontan, T. - Bilir, S. - Bostanci, Z.F. - Ak, T. - Karaali, S. - Guver, T. - Ak, S. - Duran, S. - Paunzen, Ernst
PY - 2015
TI - CCD UBVRI photometry of NGC 6811
JF - Astrophysics and Space Science
VL - 355
IS - 2
SP - 267-281
EP - 267-281
PB - Springer
SN - 0004640X
KW - Galaxy: open cluster and associations: individual: NGC 6811
KW - Stars: Hertzsprung Russell (HR) diagram
N2 - We present the results of CCD UBVRI observations of the open cluster NGC 6811 obtained on 18th July 2012 with the 1 m telescope at the TUBITAK 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 +/- 0.01 mag, mu = 10.06 +/- 0.08 mag, [M/H] = -0.10 +/- 0.01 dex and t = 1.00 +/- 0.05 Gyr, respectively. Distances of five red clump stars which were found to be members of the cluster further confirm our distance estimation.
ER -
YONTAN, T., S. BILIR, Z.F. BOSTANCI, T. AK, S. KARAALI, T. GUVER, S. AK, S. DURAN and Ernst PAUNZEN. CCD UBVRI photometry of NGC 6811. \textit{Astrophysics and Space Science}. DORDRECHT: Springer, 2015, vol.~355, No~2, p.~267-281. ISSN~0004-640X. Available from: https://dx.doi.org/10.1007/s10509-014-2175-5.
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