Metallicities on the Double Main Sequence of ω Centauri Imply Large Helium Enhancement

Piotto, G.; Villanova, S.; R. Bedin, L.; Gratton, R.; Cassisi, S.; Momany, Y.; Recio-Blanco, A.; Lucatello, S.; Anderson, Jay; R. King, Ivan; Pietrinferni, A.; Carraro, G.

doi:10.1086/427796

Public

Metallicities on the Double Main Sequence of ω Centauri Imply Large Helium Enhancement

Published in The Astrophysical Journal • Mar 10, 2005

Authors:

G. Piotto

S. Villanova

L. R. Bedin

Abstract

Having shown in a recent paper that the main sequence of ω Centauri is split into two distinct branches, we now present spectroscopic results showing that the bluer sequence is less metal-poor. We have carefully combined GIRAFFE@VLT spectra of 17 stars on each side of the split into a single spectru...

Subject

Metallicity

Physics

Stars

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