73 citations · 508 across the 14 of their papers we have counts for
10 papers
Unveiling the nature of HE 0107-5240
E. Caffau, M. Steffen, P. Molaro +27
The vast majority of the most iron-poor stars in the Galaxy exhibit a strong carbon enhancement, with C/H ratios only about two orders of magnitude below solar. This unusual chemic…
The Pristine survey. XXVI. Chemical abundances of subgiant stars of the extremelymetal-poor stream C-19
P. Bonifacio, E. Caffau, P. François +17
Context: The C-19 stellar stream is the most metal-poor stream known to date. While its width and velocity dispersion indicate a dwarf galaxy origin, its metallicity spread and abu…
On the 12C/13C isotopic ratio at the dawn of chemical evolution
P. Molaro, D. S. Aguado, E. Caffau +21
The known Mega and Hyper Metal-Poor (MMP-HMP) stars with [Fe/H]<-6.0 and <-5.0, respectively, likely belong to the CEMP-no class, i.e. carbon-enhanced stars with low or absent seco…
The Pristine survey VIII: The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime
K. Youakim, E. Starkenburg, N. F. Martin +15
The Pristine survey uses narrow-band photometry to derive precise metallicities down to the extremely metal-poor regime ([Fe/H] < -3), and currently consists of over 4 million FGK-…
IMF radial gradients in most massive early-type galaxies
F. La Barbera, A. Vazdekis, I. Ferreras +8
Using new long-slit spectroscopy obtained with X-Shooter at ESO-VLT, we study, for the first time, radial gradients of optical and Near-Infrared IMF-sensitive features in a represe…
The Pristine survey III: Spectroscopic confirmation of an efficient search for extremely metal-poor stars
K. Youakim, E. Starkenburg, D. S. Aguado +13
The Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the Ca II H & K absorption lines, designed to efficiently search for extremely meta…
New ultra metal-poor stars from SDSS: follow-up GTC medium-resolution spectroscopy
D. S. Aguado, C. Allende Prieto, J. I. González Hernández +2
Context. The first generation of stars formed in the Galaxy left behind the chemical signatures of their nucleosynthesis in the interstellar medium, visible today in the atmosphere…
WHT follow-up observations of extremely metal-poor stars identified from SDSS and LAMOST
D. S. Aguado, J. I. González Hernández, C. Allende Prieto +1
We have identified several tens of extremely metal-poor star candidates from SDSS and LAMOST, which we follow-up with the 4.2m WHT telescope to confirm their metallicity.We follow…
The Pristine survey II: a sample of bright stars observed with FEROS
E. Caffau, P. Bonifacio, E. Starkenburg +8
Extremely metal-poor (EMP) stars are old objects formed in the first Gyr of the Universe. They are rare and, to select them, the most successful strategy has been to build on large…
An equatorial ultra iron-poor star identified in BOSS
C. Allende Prieto, E. Fernandez-Alvar, D. S. Aguado +6
We report the discovery of SDSS J131326.89-001941.4, an ultra iron-poor red giant star ([Fe/H] ~ -4.3) with a very high carbon abundance ([C/Fe]~ +2.5). This object is the fifth st…