J/AJ/127/980 vby and BVI photometry of Omega Cen giants (Hughes+, 2004)
The giant branches of ω Centauri: multiwavelength observations of
evolved stars.
Hughes J., Wallerstein G., Van Leeuwen F., Hilker M.
<Astron. J., 127, 980-990 (2004)>
=2004AJ....127..980H 2004AJ....127..980H
ADC_Keywords: Clusters, globular ; Stars, giant ; Photometry, uvby
Keywords: globular clusters: individual (ω Centauri, NGC 6397) -
techniques: photometric
Abstract:
We have obtained photometric observations in a 182arcmin^2 area, 25'
to the north of the center of the globular cluster ω Centauri.
The Stroemgren vby and broadband BI filters were used to obtain
measurements for some 2500 stars. Preliminary examinations of parts of
the data have been presented previously (Hughes & Wallerstein, 2000,
Cat. J/AJ/119/1225; Hughes, Wallerstein, & van Leeuwen, 2002, in ASP
Conf. Ser. 265, 73). Here we present the complete data set, study the
giant branches, and use the B-I color index as a tool for assessing
the ages of the populations within ω Cen.
Description:
The field was observed in 1996 May on the Cerro Tololo Inter-American
Observatory (CTIO) 0.9m telescope.
Objects:
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RA (2000) DE Designation(s)
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13 26 45.9 -47 28 37 omega Cen = NGC 5139
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
position.dat 32 261 Positions, from van Leeuwen et al., 2000,
Cat. J/A+A/360/472
table2.dat 94 2554 Multiwavelength Data on ω Centauri
(Northern Field)
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See also:
J/AJ/127/958 : CCD BV photometry on Omega Cen (Rey+, 2004)
J/AJ/119/1225 : Stroemgren photometry of Omega Cen & NGC 6397 (Hughes+, 2000)
J/A+AS/115/297 : BVRI photometry of Central Field of Omega Cen (Lynga+, 1996)
J/AJ/108/1350 : Omega Cen FUV photometry (Whitney+, 1994)
J/MNRAS/250/314 : CCD photometry of omega Cen (Noble+ 1991)
J/PASP/106/828 : BVRI photometry of Omega Cen (Walker 1994)
Byte-by-byte Description of file: position.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- HWV IRAF identification number,
Cl* NGC 5139 HWV NNNN in Simbad
6- 10 I5 --- Leid van Leeuwen et al. (2000, J/A+A/360/472)
proper motion identifier,
Cl* NGC 5139 Leid NNNNN in Simbad
13- 21 F9.5 deg RAdeg Right Ascension (ICRS)
24- 32 F9.5 deg DEdeg Declination (ICRS)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- HWV IRAF identification number,
Cl* NGC 5139 HWV NNNN in Simbad
6- 10 I5 --- Leid ? van Leeuwen et al. (2000, J/A+A/360/472)
proper motion identifier,
Cl* NGC 5139 Leid NNNNN in Simbad
12- 18 F7.2 pix Xpos The X pixel coordinate (1)
20- 26 F7.2 pix Ypos The Y pixel coordinate (1)
28- 33 F6.3 mag b-y Stroemgren (b-y) color index
35- 39 F5.3 mag e_b-y Uncertainty in b-y (2)
41- 46 F6.3 mag Vmag The V-band magnitude
48- 52 F5.3 mag e_Vmag Uncertainty in Vmag (2)
54- 59 F6.3 --- m1 The Stroemgren m1 index
61- 65 F5.3 --- e_m1 Uncertainty in m1 (2)
67- 72 F6.3 mag B-I The (B-I) color index
74- 78 F5.3 mag e_B-I Uncertainty in B-I (2)
80- 85 F6.3 mag V-I The (V-I) color index
87- 91 F5.3 mag e_V-I Uncertainty in V-I (2)
93 A1 --- Status [RAC] Status code (3)
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Note (1): North is up, West is right. 1 pix = 0.396"
Note (2): Uncertainties reflect the sum in quadrature of all the components.
Note (3): Status code as follows:
R = Rejected
A = Accepted
C = Confirmed
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jul-2004