J/AJ/142/127 NGC 5822 UBVI and uvbyCaHβ photometry (Carraro+, 2011)
A UBVI and uvbyCaHβ analysis of the intermediate-age open cluster,
NGC 5822.
Carraro G., Anthony-Twarog B.J., Costa E., Jones B.J., Twarog B.A.
<Astron. J., 142, 127 (2011)>
=2011AJ....142..127C 2011AJ....142..127C
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, uvby, beta
Keywords: open clusters and associations: general -
open clusters and associations: individual (NGC 5822)
Abstract:
NGC 5822 is a richly populated, moderately nearby, intermediate-age
open cluster covering an area larger than the full moon on the sky. A
CCD survey of the cluster on the UBVI and uvbyCaHβ systems shows
that the cluster is superposed upon a heavily reddened field of
background stars with E(B-V)>0.35mag, while the cluster has small and
uniform reddening at E(b-y)=0.075±0.008mag or
E(B-V)=0.103±0.011mag, based upon 48 and 61 probable A and F dwarf
single-star members, respectively. The errors quoted include both
internal photometric precision and external photometric uncertainties.
Description:
For UBVI data, NGC 5822 was observed during two runs. During the first
run on 2009 March 19, only the central field (E) was observed, while
over the second run from 2010 March 11 to 14, an additional four
pointings (A, B, C, and D) were observed, leading to an areal coverage
40-arcmin on a side. The observations were carried out with the Y4KCAM
camera attached to the Cerro Tololo Inter-American Observatory (CTIO)
1m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 69 15444 Broad-band photometry of stars in NGC 5822 field
table5.dat 115 3661 uvbyCaHβ photometry of stars in NGC 5822 field
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See also:
J/PASP/105/78 : Photometry in open cluster NGC 5822 (Twarog+, 1993)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
10- 17 F8.4 deg DEdeg Declination in decimal degrees (J2000)
19- 24 F6.3 mag Vmag ?=99.999 The V band magnitude
26- 30 F5.3 mag e_Vmag ?=9.999 Uncertainty in Vmag
32- 37 F6.3 mag B-V ?=99.999 The (B-V) color index
39- 43 F5.3 mag e_B-V ?=9.999 Uncertainty in B-V
45- 50 F6.3 mag V-I ?=99.999 The (V-I) color index
52- 56 F5.3 mag e_V-I ?=9.999 Uncertainty in V-I
58- 63 F6.3 mag U-B ?=99.999 The (U-B) color index
65- 69 F5.3 mag e_U-B ?=9.999 Uncertainty in U-B
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
10- 17 F8.4 deg DEdeg Declination in decimal degrees (J2000)
19- 24 F6.3 mag Vmag ?=9.999 The V band magnitude
26- 30 F5.3 mag b-y ?=9.999 The (b-y) color index
32- 37 F6.3 mag m1 ?=9.999 The m1 index
39- 44 F6.3 mag c1 ?=9.999 The c1 index
46- 51 F6.3 mag hk ?=9.999 The hk index
53- 58 F6.3 mag Hb ?=9.999 The Hβ index
60- 64 F5.3 mag e_Vmag ?=9.999 Uncertainty in Vmag
66- 70 F5.3 mag e_b-y ?=9.999 Uncertainty in b-y
72- 76 F5.3 mag e_m1 ?=9.999 Uncertainty in m1
78- 82 F5.3 mag e_c1 ?=9.999 Uncertainty in c1
84- 88 F5.3 mag e_hk ?=9.999 Uncertainty in hk
90- 94 F5.3 mag e_Hb ?=9.999 Uncertainty in Hb
96- 97 I2 --- Ny Number of y filter observations
99-100 I2 --- Nb Number of b filter observations
102-103 I2 --- Nv Number of v filter observations
105-106 I2 --- Nu Number of u filter observations
108-109 I2 --- NCa Number of Ca filter observations
111-112 I2 --- Nn Number of Hβ narrow filter observations
114-115 I2 --- Nw Number of Hβ wide filter observations
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 18-Jan-2013