J/AJ/148/51 WIYN Open Cluster. LXI. NGC 6819 photometry (Anthony-Twarog+, 2014)
A uvbyCaHβ analysis of the old open cluster, NGC 6819.
Anthony-Twarog B.J., Deliyannis C.P., Twarog B.A.
<Astron. J., 148, 51 (2014)>
=2014AJ....148...51A 2014AJ....148...51A
ADC_Keywords: Clusters, open ; Photometry, uvby, beta
Keywords: open clusters and associations: general -
open clusters and associations: individual: NGC 6819
Abstract:
NGC 6819 is a richly populated, older open cluster situated within the
Kepler field. A CCD survey of the cluster on the uvbyCaHβ system,
coupled with proper-motion membership, has been used to isolate 382
highly probable, single-star unevolved main-sequence members over a
20' field centered on the cluster. From 278 F dwarfs with high
precision photometry in all indices, a mean reddening of
E(b-y)=0.117±0.005 or E(B-V)=0.160±0.007 is derived, where the
standard errors of the mean include both internal errors and the
photometric zero-point uncertainty. With the reddening fixed, the
metallicity derived from the same 278 stars is [Fe/H]=-0.116±0.101
from m1 and -0.055±0.033 from hk, for a weighted average of
[Fe/H]=-0.06±0.04, where the quoted standard errors of the mean
include the internal errors from the photometric scatter plus the
uncertainty in the photometric zero points. If metallicity is derived
using individual reddening values for each star to account for
potential reddening variation across the face of the cluster, the
analogous result is unchanged. The cluster members at the turnoff of
the color-magnitude diagram are used to test and confirm the recently
discovered variation in reddening across the face of the cluster, with
a probable range in the variation of ΔE(B-V)=0.045±0.015. With
the slightly higher reddening and lower [Fe/H] compared to commonly
adopted values, isochrone fitting leads to an age of 2.3±0.2Gyr for
an apparent modulus of (m-M)=12.40±0.12.
Description:
Intermediate and narrowband imaging of NGC 6819 was completed using
the WIYN 0.9m telescope on UT dates 2011 July 2-7, 2012 June 14-20,
and 2013 June 8-13.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 121 7187 uvbyCaHβ photometry of stars in the field
of NGC 6819
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See also:
II/215 : uvby-beta Catalogue (Hauck+ 1997)
J/AJ/148/38 : WIYN open cluster study. LX. RV survey of NGC 6819
(Milliman+, 2014)
J/AJ/146/58 : Eclipse timings for NGC 6819-259 (Jeffries+, 2013)
J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)
J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)
J/AJ/133/1585 : Stromgren photometry in NGC 6791 (Anthony-Twarog+, 2007)
J/AJ/129/872 : Stromgren photometry of NGC 2243 (Anthony-Twarog+, 2005)
J/AJ/127/1000 : Stromgren and Ca photometry of NGC 3680 (Anthony-Twarog+, 2004)
J/AJ/125/1383 : Stromgren photometry of NGC 6253 (Anthony-Twarog+, 2003)
J/AJ/121/327 : Metal Abundances of Red Clump Stars in NGC 6819
(Bragaglia+, 2001)
J/AJ/119/2282 : Stromgren photometry of IC 4651 (Anthony-Twarog+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
11- 18 F8.5 deg DEdeg Declination in decimal degrees (J2000)
20- 22 I3 % Mb [0/99]?=-99 Probability of membership (1)
24- 29 F6.3 mag Vmag [9.532/20.215]?=9.999 Stromgren V band magnitude
31- 36 F6.3 mag b-y ?=9.999 Stromgren (b-y) color index
38- 43 F6.3 mag m1 ?=9.999 Stromgren m1 index
45- 50 F6.3 mag c1 ?=9.999 Stromgren c1 index
52- 57 F6.3 mag hk ?=9.999 hk index
59- 64 F6.3 mag Hb ?=9.999 Hβ index
66- 70 F5.3 mag e_Vmag ?=9.999 Uncertainty in Vmag
72- 76 F5.3 mag e_b-y ?=9.999 Uncertainty in b-y
78- 82 F5.3 mag e_m1 ?=9.999 Uncertainty in m1
84- 88 F5.3 mag e_c1 ?=9.999 Uncertainty in c1
90- 94 F5.3 mag e_hk ?=9.999 Uncertainty in hk
96-100 F5.3 mag e_Hb ?=9.999 Uncertainty in Hb
102-103 I2 --- Ny [2/25] Number of y filter observations
105-106 I2 --- Nb [2/25] Number of b filter observations
108-109 I2 --- Nv [0/22] Number of v filter observations
111-112 I2 --- Nu [0/14] Number of u filter observations
114-115 I2 --- NCa [0/30] Number of Ca filter observations
117-118 I2 --- Nn [0/25] Number of Hβ narrow filter observations
120-121 I2 --- Nw [0/24] Number of Hβ wide filter observations
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Note (1): From Platais et al. 2013 (J/AJ/146/43).
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 25-Nov-2014