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Observations of globular clusters with FLAMES

Published online by Cambridge University Press:  23 December 2005

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.

Type
Contributed Papers
Copyright
© 2005 International Astronomical Union