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J/other/ApSS/361.126 NGC 6819 CCD UBV photometry (Ak+, 2016)
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table4.dat
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Beginning of ReadMe :J/other/ApSS/361.126 NGC 6819 CCD UBV photometry (Ak+, 2016)
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CCD UBV photometry of the open cluster NGC 6819.
Ak T., Bostanci Z.F., Yontan T., Bilir S., Guver T., Ak S., Urgup H.,
Paunzen E.
<Astrophys. Space Sci. 361, 126 (2016)>
=2016Ap&SS.361..126A (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI ;
Proper motions
Keywords: Hertzsprung-Russell and colour-magnitude diagrams -
open clusters and associations: individual: NGC 6866
Abstract:
We present the results of CCD UBV observations of the open cluster
NGC 6819. We calculated the stellar density profile in the cluster's
field to determine the structural parameters of NGC 6819. Using the
existing astrometric data, we calculated the probabilities of the
stars being physical members of the cluster, and used these objects in
the determination of the astrophysical parameters of NGC 6819. We
inferred the reddening and metallicity of the cluster as
E(B-V)=0.130+/-0.035mag and [Fe/H]=+0.051+/-0.020dex, respectively,
using the U-B vs B-V two-colour diagram and UV excesses of the F-G
type main-sequence stars. We fit the colour-magnitude diagrams of NGC
6819 with the PARSEC isochrones and derived the distance modula,
distance and age of the cluster as mu_V=12.22+/-0.10mag,
d=2309+/-106pc and t=2.4+/-0.2Gyr, respectively. The parameters of the
galactic orbit estimated for NGC 6819 indicate that the cluster is
orbiting in a slightly eccentric orbit of e=0.06 with a period of
P_orb_=142Myr. The slope of the mass function estimated for the
cluster is close to the one found for the stars in the solar
neighbourhood.
Description:
CCD UBVRI images of the open cluster NGC 6819 and standard stars
selected from Landolt (2009, Cat. J/AJ/137/4186) were acquired on 2015
May 18 using a 1-m Ritchey-Chretien telescope (T100) located at the
TUBITAK National Observatory (TUG) in Bakirlitepe, Antalya/Turkey.