J/AJ/136/506 Radial velocities of ω Centauri members (Da Costa+, 2008)
A spectroscopic survey for ω Centauri members at and beyond the
cluster tidal radius.
Da Costa G.S., Coleman M.G.
<Astron. J., 136, 506-517 (2008)>
=2008AJ....136..506D 2008AJ....136..506D
ADC_Keywords: Clusters, globular ; Photometry, UBVRI ; Radial velocities
Keywords: Galaxy: stellar content - globular clusters: general -
globular clusters: individual (omega Centauri, NGC 5139) -
stars: kinematics
Abstract:
We have used the two-degree field (2dF) multi-fiber spectrograph of
the Anglo-Australian Telescope (AAT) to search for candidate members
of the unusual globular cluster omega Centauri at and beyond the
cluster tidal radius. Velocities with an accuracy of ∼10km/s were
obtained for 4105 stars selected to lie in the vicinity of the lower
giant branch in the cluster color-magnitude diagram (CMD) and which
cover an area on the sky of ∼2.4x3.9°2 centered on the cluster.
Description:
The V- and I-band photometry was obtained with the 8kx8k CCD mosaic
camera mounted on the ANU 1m telescope at Siding Spring Observatory.
The observing run took place over 5 nights in 2003 May and a total of
16 configurations were observed: six in each of the N and S fields and
two each in the E and W fields.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 154 Probable cluster member stars
table3.dat 55 12 Probable non-cluster member stars
table4.dat 55 1183 Non-member stars
table5.dat 55 6 Candidate extra-tidal cluster members
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See also:
J/AJ/114/1087 : Omega Cen radial velocities (Mayor+ 1997)
J/A+A/445/503 : Radial velocities in Omega Cen (NGC5139) (Reijns+, 2006)
Byte-by-byte Description of file: table2.dat table3.dat table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID Stellar identification,
<[DC2008] NN-N-NNNNN> in Simbad
10 A1 --- n_ID [*] Note on ID (1)
11- 15 F5.1 arcmin Rad Radial distance from the cluster center
17- 20 I4 km/s RV Heliocentric radial velocity
22- 23 I2 --- o_ID Number of observations of ID
25- 26 I2 h RAh Hour of Right Ascension (J2000)
28- 29 I2 min RAm Minute of Right Ascension (J2000)
31- 34 F4.1 s RAs Second of Right Ascension (J2000)
36 A1 --- DE- Sign of the Declination (J2000)
37- 38 I2 deg DEd Degree of Declination (J2000)
40- 41 I2 arcmin DEm Arcminute of Declination (J2000)
43- 44 I2 arcsec DEs Arcsecond of Declination (J2000)
46- 50 F5.2 mag Vmag Coleman & Da Costa (2008, in prep.)
V band magnitude
52- 55 F4.2 mag V-I Coleman & Da Costa (2008, in prep.)
(V-I) color index
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Note (1): Star 661259 excluded on the basis of discrepant proper motion;
all others stars of table3 excluded on the basis of discrepant line
strengths;
Star 10228 is a carbon star.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 04-Feb-2011