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Observational evidence for a different IMF in the early Galaxy
Sara Lucatello, Raffaele G. Gratton, Timothy C. Beers +1
The unexpected high incidence of carbon-enhanced, s-process enriched unevolved stars amongst extremely metal-poor stars in the halo provides a significant constraint on the Initial…
The Binary Frequency Among Carbon-Enhanced, s-Process Rich, Metal-Poor Stars
Sara Lucatello, Stelios Tsangarides, Timothy C. Beers +3
We discuss radial velocities for a sample of carbon-enhanced, s-process rich, very metal-poor stars (CEMP-s hereafter), analyzed with high-resolution spectroscopy obtained over mul…
Metallicities on the Double Main Sequence of omega Centauri Imply Large Helium Enhancement
Giampaolo Piotto, Sandro Villanova, Luigi R. Bedin +10
Having shown in a recent paper that the main sequence of omega Centauri is split into two distinct branches, we now present spectroscopic results showing that the bluer sequence is…
Abundances of C, N, O in slightly evolved stars in the globular clusters NGC 6397, NGC 6752 and 47 Tuc
Eugenio Carretta, Raffaele Gratton, Sara Lucatello +2
Abundances of C and N are derived from features due to the CH G-band and to the UV CN band measured on high resolution (R ~ 40,000) UVES spectra of more than 40 dwarfs and subgiant…
Abundances of Extremely Metal-Poor Star Candidates
D. K. Lai, M. Bolte, J. A. Johnson +1
We present chemical abundances for 110 stars identified in objective-prism surveys as candidates to be very metal-poor. The abundances are derived from high S/N, intermediate-resol…
No Planet Around HD 219542 B
S. Desidera, R. G. Gratton, M. Endl +8
The star HD 219542 B has been reported by us (Desidera et al. 2003) to show low-amplitude radial velocity variations that could be due to the presence of a Saturn-mass planetary co…