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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
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.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 04-Feb-2011
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