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J/ApJ/731/64 Spectroscopy of 300 RGB in omega Cen (Marino+, 2011)
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Beginning of ReadMe :J/ApJ/731/64 Spectroscopy of 300 RGBs in omega Cen (Marino+, 2011)
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Sodium-oxygen anticorrelation and neutron-capture elements in Omega Centauri
stellar populations.
Marino A.F., Milone A.P., Piotto G., Villanova S., Gratton R., D'Antona F.,
Anderson J., Bedin L.R., Bellini A., Cassisi S., Geisler D., Renzini A.,
Zoccali M.
<Astrophys. J., 731, 64 (2011)>
=2011ApJ...731...64M
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ADC_Keywords: Abundances, [Fe/H] ; Stars, giant ; Clusters, globular
Keywords: globular clusters: individual (NGC 5139) - stars: abundances -
stars: Population II
Abstract:
Omega Centauri is no longer the only globular cluster known to contain
multiple stellar populations, yet it remains the most puzzling. Due to
the extreme way in which the multiple stellar population phenomenon
manifests in this cluster, it has been suggested that it may be the
remnant of a larger stellar system. In this work, we present a
spectroscopic investigation of the stellar populations hosted in the
globular cluster omega Centauri to shed light on its still puzzling
chemical enrichment history. With this aim, we used FLAMES+GIRAFFE@VLT
to observe 300 stars distributed along the multimodal red giant branch
of this cluster, sampling with good statistics the stellar populations
of different metallicities. We determined chemical abundances for Fe,
Na, O, and n-capture elements Ba and La. We confirm that omega
Centauri exhibits large star-to-star variations in iron with [Fe/H]
ranging from -2.0 to -0.7dex. Barium and lanthanum abundances of
metal-poor stars are correlated with iron, up to [Fe/H] -1.5, while
they are almost constant (or at least have only a moderate increase)
in the more metal-rich populations. There is an extended Na-O
anticorrelation for stars with [Fe/H]< -1.3 while more metal-rich
stars are almost all Na-rich. Sodium was found to mildly increase with
iron over the entire metallicity range.
Description:
The data set consists of a large number of FLAMES/GIRAFFE spectra
(proposals: 071.D-0217(A), 082.D-0424(A)) taken with the four setups
HR09B, HR11, HR13, and HR15, which cover a spectral coverage of
5095-5404, 5597-5840, 6120-6405, and 6607-6965AA, respectively, with
a resolution R 20000-25000. The sample is composed of 300 red giants
with V<=15.