J/ApJ/681/1505          Omega Centauri RGB abundances           (Johnson+, 2008)
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Beginning of ReadMe : J/ApJ/681/1505 Abundances of red giants in omega Cen (Johnson+, 2008) ================================================================================ Fe and Al abundances for 180 red giants in the globular cluster omega Centauri (NGC 5139). Johnson C.I., Pilachowski C.A., Simmerer J., Schwenk D. <Astrophys. J., 681, 1505-1523 (2008)> =2008ApJ...681.1505J (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Stars, giant ; Abundances, [Fe/H] ; Radial velocities ; Clusters, globular ; Equivalent widths ; Photometry ; Spectroscopy Keywords: globular clusters: general - stars: abundances - stars: Population II globular clusters: individual (omega Centauri, NGC 5139) Abstract: We present radial velocities and Fe and Al abundances for 180 red giant branch (RGB) stars in the Galactic globular cluster Omega Centauri (omega Cen). The majority of our data lie in the range 11.0<V<13.5, which covers the RGB from about 1mag above the horizontal branch to the RGB tip. The selection procedures are biased toward preferentially observing the more metal-poor and luminous stars of omega Cen. Abundances were determined using equivalent width measurements and spectrum synthesis analyses of moderate resolution spectra (R 13000) obtained with the Blanco 4m telescope and Hydra multifiber spectrograph. Our results are in agreement with previous studies as we find at least four different metallicity populations with [Fe/H]=-1.75, -1.45, -1.05, and -0.75, with a full range of -2.20< [Fe/H]< -0.70. Results seem to fit in the adopted scheme that star formation occurred in omega Cen over >1Gyr. Description: The observations of all 180 giants in omega Cen were obtained with the Blanco 4m telescope using the Hydra multifiber positioner and bench spectrograph at the Cerro Tololo Inter-American Observatory, in UT 2003 July 17, 18 and 19. Spectra include the region from 6500-6750AA. Target stars, coordinates, photometry, and membership probability were taken from the proper motion study by van Leeuwen et al. (2000, Cat. J/A+A/360/472). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 13 26 45.9 -47 28 37 omega Centauri = NGC 5139 ----------------------------------------------------------