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Fluorine in AGB Carbon Stars Revisited
C. Abia, A. Recio-Blanco, P. de Laverny +3
A reanalysis of the fluorine abundance in three Galactic AGB carbon stars (TX Psc, AQ Sgr and R Scl) has been performed from the molecular HF (1-0) R9 line at 2.3358 m. High-res…
Parameter Estimation from an Optimal Projection in a Local Environment
A. Bijaoui, A. Recio-Blanco, P. de Laverny
The parameter fit from a model grid is limited by our capability to reduce the number of models, taking into account the number of parameters and the non linear variation of the mo…
The link between chemical anomalies along the red giant branch and the horizontal branch extension in globular clusters
Eugenio Carretta, Alejandra Recio-Blanco, Raffaele G. Gratton +2
We find a strong correlation between the extension of the Na-O anticorrelation observed in red giant branch (RGB) stars and the high temperature extension of the horizontal branch…
Spectroscopy of horizontal branch stars in NGC6752 - Anomalous results on atmospheric parameters and masses
C. Moni Bidin, S. Moehler, G. Piotto +2
We used the ESO VLT-FORS2 facility to collect low-resolution spectra of 51 targets distributed along the Horizontal Branch. We determined atmospheric parameters by comparison with…
The multiplicity of the subgiant branch of Omega Centauri: Evidence for prolonged star formation
S. Villanova, G. Piotto, I. R. King +9
We present metallicity measurements based on GIRAFFE@VLT spectra of 80 subgiant-branch stars of the Galactic globular cluster Omega Centauri. The VLT spectroscopic data are complem…
Doppler search for exoplanet candidates and binaries in a CoRoT field using a multi-fiber spectrograph
B. Loeillet, F. Bouchy, M. Deleuil +8
The discovery of the short-period giant exoplanet population, the so-called hot Jupiter population, and their link to brown dwarfs and low-mass stars challenges the conventional vi…