Publications (14)
The VISTA Variables in the VÃa Láctea eXtended (VVVX) ESO public survey: Completion of the observations and legacy
R. K. Saito, M. Hempel, J. Alonso-GarcÃa +143
The ESO public survey VISTA Variables in the VÃa Láctea (VVV) surveyed the inner Galactic bulge and the adjacent southern Galactic disk from . Upon its conclusion, the…
Distribution of refractory and volatile elements in CoRoT exoplanet host stars
C. Chavero, R. de la Reza, R. C. Domingos +3
The relative distribution of abundances of refractory, intermediate, and volatile elements in stars with planets can be an important tool for investigating the internal migration o…
The evolution of lithium in FGK dwarf stars. Influence of planets and Galactic migration
F. Llorente de Andrés, R. de la Reza, P. Cruz +4
This work aims to investigate the behaviour of the lithium abundance in stars with and without detected planets. Our study is based on a sample of 1332 FGK main-sequence stars with…
Gravitational redshifts in main-sequence and giant stars
L. Pasquini, C. Melo, C. Chavero +4
Gravitational redshifts in solar-type main-sequence stars are expected to be some 500 ms greater than those in giants. Such a signature is searched for between groups of ope…
Chemical abundances and kinematics of barium stars
D. B. de Castro, C. B. Pereira, F. Roig +4
In this paper we present an homogeneous analysis of photospheric abundances based on high-resolution spectroscopy of a sample of 182 barium stars and candidates. We determined atmo…
A Possible Stellar Metallic Enhancement in Post-T Tauri Stars by a Planetesimal Bombardment
O. C. Winter, R. de la Reza, R. C. Domingos +2
The photospheres of stars hosting planets have larger metallicity than stars lacking planets. In the present work we study the possibility of an earlier metal enrichment of the pho…
Chemical abundances and kinematics of a sample of metal-rich barium stars
C. B. Pereira, J. V. Sales Silva, C. Chavero +2
We determined the atmospheric parameters and abundance pattern for a sample of metal-rich barium stars. We used high-resolution optical spectroscopy. Atmospheric parameters and abu…
The evolution of lithium in FGK dwarf stars: The Li rotation connection and the Li desert
F. Llorente de Andrés, C. Chavero, R. de la Reza +2
We investigate two topics regarding solar mass FGK-type stars, the lithium rotation connection (LRC) and the existence of the "lithium desert". We determine the minimum critical ro…
Stellar parameters and chemical abundances of 223 evolved stars with and without planets
E. Jofré, R. Petrucci, C. Saffe +5
We present fundamental stellar parameters and chemical abundances for a sample of 86 evolved stars with planets and for a control sample of 137 stars without planets. The analysis…
Emerging trends in metallicity and lithium properties of debris disc stars
C. Chavero, R. de la Reza, L. Ghezzi +5
Dwarf stars with debris discs and planets appear to be excellent laboratories to study the core accretion theory of planets formation. These systems are however, insufficiently stu…
Evolved stars hint to an external origin of enhanced metallicity in planet-hosting stars
L. Pasquini, M. P. Doellinger, A. Weiss +5
Exo-planets are preferentially found around high metallicity main sequence stars. We aim at investigating whether evolved stars share this property, and what this tells about plane…
On the Ages of Exoplanet Host Stars
C. Saffe, M. Gomez, C. Chavero
We obtained spectra, covering the CaII H and K region, for 49 exoplanet host (EH) stars, observable from the southern hemisphere. We measured the chromospheric activity index, Rhk.…
Searching for the nature of stars with debris disks and planets
R. de la Reza, C. Chavero, S. Roca-FÃ brega +3
The nature of the few known solar-mass stars simultaneously containing debris disks and planets remains an open question. A number of works have shown that this property appears to…
CD-62\degree1346: an extreme halo or hypervelocity CH~star?
C. B. Pereira, E. Jilinski, N. A. Drake +4
High-velocity halo stars provide important information about the properties of the extreme Galactic halo. The study of unbound and bound Population II stars permits us to better es…