J/AJ/127/958 CCD BV photometry on Omega Cen (Rey+, 2004)
CCD photometry of the globular cluster ω Centauri.
II. Stellar populations and age-metallicity relation.
Rey S.-C., Lee Y.-W., Ree C.H., Joo J.-M., Sohn Y.-J., Walker A.R.
<Astron. J., 127, 958-979 (2004)>
=2004AJ....127..958R 2004AJ....127..958R
ADC_Keywords: Clusters, globular ; Photometry, CCD ; Photometry, UBV
Keywords: color-magnitude diagrams - globular clusters: general -
globular clusters: individual (ω Centauri)
Abstract:
We present wide-field and high-precision BV and Ca and Stroemgren by
photometry of ω Centauri, which represents one of the most
extensive photometric surveys to date for this cluster. The member
stars of ω Cen are well discriminated from foreground Galactic
field stars in the hk[=(Ca-b)-(b-y)] versus b-y diagram. The resulting
"cleaned" color-magnitude diagram (CMD) has allowed us to obtain an
accurate distribution of the red horizontal-branch (HB) and the
asymptotic giant branch stars.
Description:
All the observations were made using the Cerro Tololo Inter-American
Observatory (CTIO) 0.9m telescope and Tektronix 2048 No. 3 CCD during
six nights of an observing run in 1996 April 5-10.
Here, only selected stars with a frame-to-frame errors in the B and V
magnitudes of less than 0.05mag are presented. The full data table
will be published in a forthcoming paper.
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
table2.dat 49 84096 CCD Photometry for member stars of ω Cen
table3.dat 49 835 CCD Photometry for field star candidates with V<16.0
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See also:
J/AJ/127/980 : vby and BVI photometry of Omega Cen giants (Hughes+, 2004)
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/AJ/119/1225 : Stroemgren photometry of Omega Cen & NGC 6397 (Hughes+, 2000)
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: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- RLR Stellar identification number (1)
7- 13 F7.2 pix Xpos The X pixel coordinate (2)
15- 22 F8.2 pix Ypos The Y pixel coordinate (2)
24- 29 F6.3 mag Vmag The V band magnitude
31- 35 F5.3 mag e_Vmag The 1σ error in Vmag
37- 42 F6.3 mag B-V The (B-V) color
44- 48 F5.3 mag e_B-V The 1σ error in B-V
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Note (1): Table 2 : Cl* NGC 5139 RLR NNNNN in Simbad
Table 3 : Cl* NGC 5139 RLR FNNN in Simbad
Note (2): Relative to the origin of the field F1,
(RA, DE) = (13 28 04.60, -47 41 32.10) (J2000.0). 1pix = 0.396".
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jul-2004