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Observations of globular clusters with FLAMES

Published online by Cambridge University Press:  23 December 2005

Raffaele Gratton ,
Angela Bragaglia ,
Eugenio Carretta ,
Sara Lucatello ,
Luigi R. Bedin ,
Giampaolo Piotto  and
Sandro Villanova
Raffaele Gratton
Affiliation:
INAF – Osservatorio Astronomico di Padova, ITALY email: [email protected]
Angela Bragaglia
Affiliation:
INAF – Osservatorio Astronomico di Bologna, ITALY
Eugenio Carretta
Affiliation:
INAF – Osservatorio Astronomico di Bologna, ITALY
Sara Lucatello
Affiliation:
INAF – Osservatorio Astronomico di Padova, ITALY email: [email protected]
Luigi R. Bedin
Affiliation:
Dipartimento di Astronomia, Università di Padova, ITALY European Southern Observatory, Garching, GERMANY
Giampaolo Piotto
Affiliation:
Dipartimento di Astronomia, Università di Padova, ITALY
Sandro Villanova
Affiliation:
Dipartimento di Astronomia, Università di Padova, ITALY
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Abstract

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We present preliminary results of a few observing programs conducted with the FLAMES fiber facility at VLT2 ESO telescope. These programs show the large potentiality of FLAMES for investigations of globular clusters. The programs described here concern the derivation of precise reddening and metallicity for globular clusters, and the derivation of abundances for stars on the main sequence of ω Cen. Reddenings with errors of $\Delta E(B-V)=0.005$ mag and metallicities with errors of ±0.02 dex (in a scale defined by local subdwarfs) can be obtained in very short observing time. Our results for ω Cen show that the blue main sequence is more metal-rich than the red-main sequence: this requires a large He-content for the blue main sequence.

Keywords

Galaxy: globular clusters: individual (NGC6752, ω Cen)stars: abundancesinstrumentation: spectrographs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 357 - 362
Copyright
© 2005 International Astronomical Union