326 citations
- Galaxies, Etoiles, Physique et InstrumentationFR20 papers
- Centre National de la Recherche ScientifiqueFR14 papers
- Trieste Astronomical ObservatoryIT12 papers
- Université Paris CitéFR11 papers
- Observatoire de ParisFR10 papers
- National Institute for AstrophysicsIT9 papers
- Délégation Paris 7FR8 papers
- Janssen (France)FR8 papers
- European Southern ObservatoryCL7 papers
- University of California, BerkeleyUS6 papers
- Leibniz Institute for Astrophysics PotsdamDE5 papers
- Consejo Superior de Investigaciones CientíficasES4 papers
8 papers · 1 filter
First stars VII. Lithium in extremely metal poor dwarfs
P. Bonifacio, P. Molaro, T. Sivarani +12
Aims. This study aims to determine the level and constancy of the Spite plateau as definitively as possible from homogeneous high-quality VLT-UVES spectra of 19 of the most metal-p…
High-resolution spectroscopy of RGB stars in the Sagittarius Streams. I. Radial velocities and chemical abundances
L. Monaco, M. Bellazzini, P. Bonifacio +5
Context. The Sagittarius (Sgr) dwarf spheroidal galaxy is currently being disrupted under the strain of the Milky Way. A reliable reconstruction of Sgr star formation history can o…
The First Direct Measurements of Magnetic Fields on Very Low-Mass Stars
A. Reiners, G. Basri
We present the first direct magnetic field measurements on M dwarfs cooler than spectral class M4.5. Utilizing a new method based on the effects of a field on the FeH band near 1 m…
First stars X. The nature of three unevolved Carbon-Enhanced Metal-Poor stars
T. Sivarani, T. C. Beers, P. Bonifacio +13
From high-resolution VLT/UVES spectra (R~43,000), we determine abundances or upper limits for Li, C, N, O, and other important elements, as well as 12C/13C isotopic ratio for three…
XTE J1118+480: A Metal-Rich Black Hole Binary in the Galactic Halo
Jonay I. Gonzalez Hernandez, Rafael Rebolo, Garik Israelian +3
We present medium-resolution optical spectra of the secondary star in the high Galactic latitude black hole X-ray binary XTE J1118+480 and determine the abundance of Mg, Al, Ca, Fe…
A Survey for Spectroscopic Binaries Among Very Low-Mass Stars
Gibor Basri, Ansgar Reiners
We report on the results of a survey for radial velocity variability in a heterogeneous sample of very low-mass stars and brown dwarfs. One distinguishing characteristic of the sur…