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American Astronomical Society, Astrophysical Journal, 1(663), p. 296-314, 2007

DOI: 10.1086/517905

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The Multiplicity of the Subgiant Branch of ω Centauri: Evidence for Prolonged Star Formation

Journal article published in 2007 by S. Villanova, G. Piotto ORCID, I. R. King, J. Anderson, L. R. Bedin ORCID, R. G. Gratton ORCID, S. Cassisi ORCID, Y. Momany, A. Bellini, A. M. Cool, A. Recio Blanco, A. Renzini ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We combine spectroscopic and photometric data for subgiant stars of ω Cen to extract results that neither data set could have provided on its own. GIRAFFE@VLT spectra of 80 stars at R=6400 give metallicities for all of them and abundances of C, N, Ca, Ti, and Ba for a subset of them. The photometric data, which have unusually high accuracy, come from a ~10×10 arcmin2 mosaic of HST ACS images centered on the cluster center and on multicolor images of a ~34×33 arcmin2 field, taken with the WFI@ESO2.2m camera. Stars with [Fe/H]