J/AJ/133/1447 Light curves of variable stars in ω Cen (Weldrake+, 2007)
A deep wide-field variable star catalog of ω Centauri.
Weldrake D.T.F., Sackett P.D., Bridges T.J.
<Astron. J., 133, 1447-1469 (2007)>
=2007AJ....133.1447W 2007AJ....133.1447W
ADC_Keywords: Clusters, globular ; Binaries, eclipsing ; Photometry
Keywords: binaries: eclipsing - binaries: general - delta Scuti -
globular clusters: individual (omega Centauri) -
stars: variables: other
Abstract:
We present a variable star catalog of an extensive ground-based
wide-field variability survey in the globular cluster omega Centauri.
Using the Australian National University 40 inch (1m) telescope at
Siding Spring Observatory, the cluster was observed with a 52'x52'
(0.75deg2) field for 25 nights, from 2003 May 2 to May 27. A total
of 187 variable stars were identified in the field, 81 of which are
new discoveries. This work comprises the widest field variability
survey yet undertaken for this cluster. Here we present the V+R light
curves and preliminary analysis of the detected variable stars,
comprising 58 eclipsing binaries, 69 RR Lyrae stars, 36 long-period
variables (P≥2days), and 24 miscellaneous pulsators including 15 SX
Phoenicis stars and two type II Cepheids.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 92 187 The total variable star catalog
lc/* . 187 Individual light curves
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See also:
J/A+A/424/1101 : Variable Stars in the field of ω Cen (Kaluzny+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Name Source identification, VNNN,
Cl* NGC 5139 WSB VNNN in Simbad
6- 17 A12 --- Type Source type (1)
18 A1 --- u_Type [?] Uncertainty flag on Type
19 A1 --- l_Per Limit flag on Per
20- 25 F6.3 d Per Period
27- 31 F5.3 d Per2 ? Alternative period due to incomplete phase
coverage (2)
33 A1 --- f_Per Uncertain period (3)
35- 36 I2 h RAh Hour of Right Ascension (J2000)
38- 39 I2 min RAm Minute of Right Ascension (J2000)
41- 45 F5.2 s RAs Second of Right Ascension (J2000)
47 A1 --- DE- Sign of the Declination (J2000)
48- 49 I2 deg DEd Degree of Declination (J2000)
51- 52 I2 arcmin DEm Arcminute of Declination (J2000)
54- 58 F5.2 arcsec DEs Arcsecond of Declination (J2000)
60- 64 F5.2 mag Vmag Intensity-averaged V band magnitude (4)
66- 70 F5.2 mag V-Ic Intensity-averaged (V-Ic) color index (4)
72- 73 A2 --- f_Amp Limit flag on Amp
74- 77 F4.2 mag Amp The V+R band amplitude
79- 83 A5 --- SAW Kaluzny et al. (2004, Cat. J/A+A/424/1101)
previous source name (5)
85- 92 A8 --- FileName Name of the file containing the light curve
in subdirectory lc
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Note (1): Source type is:
EcB = Eclipsing Binary
S.Det.EcB = semi-detached system
Det.EcB = detached system
LPV = long period variable
Puls = pulsating variable
RR Lyr = RR Lyrae type variable
SX Phe = SX Phe type variable
TypeII Ceph = Type II Cepheid
Note (2): Added if the type of variable is uncertain
(i.e. pulsator or eclipsing binary).
Note (3): Period flag as follows:
* = system that contains only one eclipse in the data and had the
period determined via the visible secondary ellipsoidal variations.
? = uncertain period because uncertain variable type
Note (4): From the CMD data set.
Note (5): Objects identified as Cl* NGC 5139 SAW VNNN in Simbad.
(- = new discovery)
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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1- 11 F11.5 d MJD Modified Julian Date
13- 28 E16.12 mag Dmag ?=-99. V+R differential magnitude (1)
30- 45 F16.12 mag e_Dmag ?=-70.0999985 Error in Dmag (2)
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Note (1): The differential magnitude is the delta magnitude of the star as
determined via the method described in the paper. This data was taken
with a V+R filter.
Note (2): The error in the differential magnitude is the error determined
via the differential imaging codes, and converted to magnitude units.
For details on how the codes calculate their errors please see
Wozniak, 2000AcA....50..421W 2000AcA....50..421W. Negative magnitudes of -99.0 define
unknown values.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 17-Feb-2009