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The extra-mixing efficiency in very low metallicity RGB stars
Alejandra Recio-Blanco, Patrick De Laverny
AIMS: After the first dredge-up, low-mass Red Giant Branch (RGB) stars experience an extra-mixing episode that strongly affects the chemical abundances on their surface. This mixin…
The lack of binaries among hot horizontal branch stars: M80 and NGC5986
C. Moni Bidin, S. Moehler, G. Piotto +3
We present preliminary results of a our search for close (period P < 10 days) binary systems among hot (Teff > 20000 K) horizontal branch stars in globular clusters M80 and NGC5986…
Automated derivation of stellar atmospheric parameters and chemical abundances: the MATISSE algorithm
A. Recio-Blanco, A. Bijaoui, P. de Laverny
We present an automated procedure for the derivation of atmospheric parameters (Teff, log g, [M/H]) and individual chemical abundances from stellar spectra. The MATrix Inversion fo…
Abundance anomalies in NGC 2808
G. Pace, A. Recio-Blanco, G. Piotto +1
We present metallicity measurements of 25 stars in the blue horizontal branch of the Galactic globular cluster NGC 2808. Our measurements are based on moderate-resolution spectra t…
The lack of close binaries among hot horizontal branch stars in NGC6752
C. Moni Bidin, S. Moehler, G. Piotto +3
We present the results of a spectroscopic search for close binaries among horizontal branch (HB) stars in NGC6752. We used the ESO VLT-FORS2 instrument to obtain medium resolution…