J/AJ/147/139 UBVRI CCD photometry of open clusters. II. NGC 6866 (Janes+, 2014)
Open clusters in the Kepler field. II. NGC 6866.
Janes K., Barnes S.A., Meibom S., Hoq S.
<Astron. J., 147, 139 (2014)>
=2014AJ....147..139J 2014AJ....147..139J
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD
Keywords: Hertzsprung-Russell and C-M diagrams - methods: data analysis -
open clusters and associations: individual: NGC 6866
Abstract:
We have developed a maximum-likelihood procedure to fit theoretical
isochrones to the observed cluster color-magnitude diagrams of
NGC6866, an open cluster in the Kepler spacecraft field of view. The
Markov chain Monte Carlo algorithm permits exploration of the entire
parameter space of a set of isochrones to find both the best solution
and the statistical uncertainties. For clusters in the age range of
NGC6866 with few, if any, red giant members, a purely photometric
determination of the cluster properties is not well-constrained.
Nevertheless, based on our UBVRI photometry alone, we have derived the
distance, reddening, age, and metallicity of the cluster and
established estimates for the binary nature and membership probability
of individual stars. We derive the following values for the cluster
properties: (m-M)V=10.98±0.24, E(B-V)=0.16±0.04 (so the
distance=1250pc), age=705±170Myr, and Z=0.014±0.005.
Description:
We acquired CCD images of the cluster and standard stars on four
nights, with the 1.2m Hall and 1.8m Perkins telescopes at the Lowell
Observatory: on 2009 Sep 21 with the 1.8m Perkins (Fairchild CCD
detector), on 2009 Sep 25 with the Hall 1.2m (SITe CCD detector), and
on 2010 Sep 17-18 with the Hall 1.2m (e2v CCD detector).
Objects:
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RA (ICRS) DE Designation(s)
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20 03 55 +44 09.5 NGC 6866 = Cl Melotte 229
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 101 7714 Photometric catalog in the region of NGC 6866
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See also:
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/MNRAS/429/1466 : Kepler stars in the NGC 6866 field (Balona+, 2013)
J/AJ/145/7 : UBVRI photometry of the open cluster NGC 6811 (Janes+, 2013)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/PAZh/36/354 : NGC 6866 proper motions and CCD photometry (Frolov+, 2010)
J/AcA/59/193 : BV photometry of stars in NGC 6866 (Molenda-Zakowicz+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Star [1/7714] Running star number (in RA order)
6- 13 F8.2 arcsec Xpos [-1267.53/1279.18] X position
(X=αcosδ) (1)
15- 22 F8.2 arcsec Ypos [-1176.55/1287.53] Y position (Y=δ) (1)
24- 29 F6.3 mag Vmag [10.104/21.328] Johnson V band magnitude
31- 35 F5.3 mag e_Vmag Error in Vmag
37- 42 F6.3 mag B-V ?=99.999 The Johnson (B-V) color index
44- 48 F5.3 mag e_B-V ?=9.999 Error in B-V
50- 55 F6.3 mag U-B ?=99.999 The Johnson (U-B) color index
57- 61 F5.3 mag e_U-B ?=9.999 Error in U-B
63- 68 F6.3 mag V-R ?=99.999 The Cousins (V-R) color index
70- 74 F5.3 mag e_V-R ?=9.999 Error in V-R
76- 81 F6.3 mag V-I ?=99.999 The Cousins (V-I) color index
83- 87 F5.3 mag e_V-I ?=9.999 Error in V-I
89- 90 I2 --- NU [0/12] Number of U filter frames
92- 93 I2 --- NB [0/30] Number of B filter frames
95- 96 I2 --- NV [3/30] Number of V filter frames
98 I1 --- NR [0/6] Number of R filter frames
100-101 I2 --- NI [0/22] Number of I filter frames
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Note (1): Relative to cluster center (20:03:55.0 +44:09:30.0; J2000).
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History:
From electronic version of the journal
References:
Janes et al., Paper I, 2013AJ....145....7J 2013AJ....145....7J, cat. J/AJ/145/7
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 01-Oct-2014