J/other/ApSS/361.126 NGC 6819 CCD UBV photometry (Ak+, 2016)
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 2016Ap&SS.361..126A (SIMBAD/NED BibCode)
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
Porb=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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 96 7060 Photometric and astrometric catalogue NGC 6819
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See also:
J/AJ/121/327 : Red Clump Stars in NGC6819 (Bragaglia+, 2001)
J/MNRAS/358/795 : Variable stars in NGC 6819 field (Street+, 2005)
J/AJ/138/159 : NGC6819 stellar radial-velocity & photometry (Hole+ 2009)
J/ApJ/729/L10 : KIC stars properties in NGC 6791 & NGC 6819 (Basu+, 2011)
J/AJ/146/43 : WIYN OCS. LV. NGC 6819 (Platais+, 2013)
J/AJ/148/38 : WIYN OCS. LX. RV survey of NGC 6819 (Milliman+, 2014)
J/AJ/148/51 : WIYN OCS. LXI. NGC 6819 photometry (Anthony-Twarog+ 2014)
J/AJ/149/121 : WOCS. LXV. Abundances in NGC 6819 (Lee-Brown+, 2015)
J/other/RAA/15.2193 : NGC 6819 3D members (Gao+, 2015)
J/MNRAS/453/1095 : NGC 6866 UBVRI photometry (Bostanci+, 2015)
J/other/ApSS/355.267 : NGC 6811 CCD UBVRI photometry (Yontan+, 2015)
J/other/AdSpR/58.1900 : NGC 225 CCD UBV photometry (Bilir+, 2016)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [1/7060] Sequential number
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 29 F5.2 arcsec DEs Declination (J2000)
31- 36 F6.3 mag Vmag Johnson V magnitude
38- 42 F5.3 mag e_Vmag ? rms uncertainty on Vmag
44- 49 F6.3 mag U-B ? Johnson U-B colour index
51- 55 F5.3 mag e_U-B ? rms uncertainty on U-B
57- 62 F6.3 mag B-V ? Johnson B-V colour index
64- 68 F5.3 mag e_B-V ? rms uncertainty on B-V
70- 75 F6.1 mas/yr pmRA ? Proper motion component (pmRA*cosDE)
77- 80 F4.1 mas/yr e_pmRA ? rms uncertainty on pmRA
82- 87 F6.1 mas/yr pmDE ? Proper motion component
89- 92 F4.1 mas/yr e_pmDE ? rms uncertainty on pmDE
94- 96 I3 % Pmemb ? Membership probability
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Acknowledgements:
Selcuk Bilir, sbilir(at)istanbul.edu.tr
(End) Patricia Vannier [CDS] 23-Nov-2016