J/other/ApSS/355.267 NGC 6811 CCD UBVRI photometry (Yontan+, 2015)
CCD UBVRI photometry of NGC 6811.
Yontan T., Bilir S., Bostanc Z.F., Ak T., Karaali S., Guver T., Ak S.,
Duran S., Paunzen E.
<Astrophys. Space Sci. 355, 267 (2015)>
=2015Ap&SS.355..267Y 2015Ap&SS.355..267Y (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD
Keywords: Galaxy: open cluster and associations: individual: NGC 6811 -
stars: Hertzsprung Russell (HR) diagram
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
TIBITAK 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
0.03mag 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. (2011ApJ...730....3S 2011ApJ...730....3S) together with other
techniques. The core radius of the cluster is found to be
rc=3.60arcmin. 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±0.01mag, µ=10.06±0.08mag, [M/H]=-0.10±0.01dex and
t=1.00±0.05Gyr, respectively. Distances of five red clump stars
which were found to be members of the cluster further confirm our
distance estimation.
Description:
CCD UBVRI observations of NGC 6811 were carried out on 18th July 2012
using the 1m Ritchey-Chretien telescope (T100) located at the
TUBITAK National Observatory (TUG) in Bakirlitepe, Antalya/Turkey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 102 1591 Photometric catalogue for the open cluster NGC 6811
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See also:
J/PAZh/25/115 : A study of the open cluster NGC 6811 (Glushkova+, 1999)
J/ApJ/733/L9 : Stellar rotation for 71 NGC 6811 members (Meibom+, 2011)
J/other/RMxAA/47.309 : NGC 6811 & NGC 6830 uvby-β photometry (Pena+, 2011)
J/AJ/145/7 : NGC 6811 UBVRI CCD photometry (Janes+, 2013)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/1591] Sequential number
6- 7 I2 h RAh Right ascension (J2000.0)
9- 10 I2 min RAm Right ascension (J2000.0)
12- 16 F5.2 s RAs Right ascension (J2000.0)
17 A1 --- DE- Declination sign (J2000.0)
18- 19 I2 deg DEd Declination (J2000.0)
21- 22 I2 arcmin DEm Declination (J2000.0)
24- 28 F5.2 arcsec DEs Declination (J2000.0)
30- 35 F6.3 mag Vmag Visual magnitude
37- 41 F5.3 mag e_Vmag rms uncertainty on visual magnitude
43- 48 F6.3 mag U-B U-B colour index
50- 54 F5.3 mag e_U-B rms uncertainty on U-B colour index
56- 60 F5.3 mag B-V B-V colour index
62- 66 F5.3 mag e_B-V rms uncertainty on B-V colour index
68- 72 F5.3 mag V-R V-R colour index
74- 78 F5.3 mag e_V-R rms uncertainty on V-R colour index
80- 84 F5.3 mag V-I V-I colour index
86- 90 F5.3 mag e_V-I rms uncertainty on V-I colour index
92- 96 F5.3 mag R-I R-I colour index
98-102 F5.3 mag e_R-I rms uncertainty on R-I colour index
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Acknowledgements:
Selcuk Bilir, sbilir(at)istanbul.edu.tr
(End) Patricia Vannier [CDS] 07-Sep-2015