23 citations · 142 across the 27 of their papers we have counts for
14 papers · 1 filter
Plato benchmark stars I. The initial benchmark sample
T. Merle, P. F. L. Maxted, O. L. Creevey +22
The ESA PLATO mission aims to detect and characterise Earth-size exoplanets orbiting bright, late-type stars using high-precision photometry and asteroseismology. Precise stellar p…
The oldest low- thin disc stars
Riano E. Giribaldi, Laura Magrini, Marco Palla +1
The formation pathway of the -poor Milky Way thin disc remains under debate. The latest observational data indicates the presence of comparable numbers of old stars in both the…
The T-GEX project. I. Stealth UV-bright Sun-like stars in the Galaxy as candidate contributors to the UV upturn
M. L. L. Dantas, D. Beltrán, R. E. Giribaldi +3
We constructed the Tiny Gaia-ESO + GALEX (T-GEX) catalogue by combining Gaia-ESO spectroscopy, Gaia DR3 astrometry, GALEX UV photometry, and 2MASS and AllWISE infrared measurements…
Observational Signatures and Constraints on the Intermediate Neutron-Capture Process. The Case of the CEMP star TYC 6044-714-1 (RAVE J094921.8-161722)
Riano E. Giribaldi, Diego Vescovi, Laura Magrini +6
Observational abundances of CEMP stars with patterns in between those produced by the rapid and slow nucleosynthesis processes (CEMP-rs stars) are currently invoked as evidence of…
The nucleosynthesis of Ba in the Early Universe. Constraints from elemental abundances and isotopic ratios
Riano E. Giribaldi, Marco Palla, Laura Magrini +6
The [Ba/Eu] abundance ratio is commonly adopted as a tracer of the relative contributions of the slow (s) and rapid (r) neutron-capture processes. However, at [Fe/H] < -2 dex, Ba c…
Distinct barium isotope ratios in CEMP-s and CEMP-rs stars
T. M. Sitnova, L. I. Mashonkina, A. M. Romanovskaya +2
We present a spectroscopic analysis of ten carbon enhanced metal-poor (CEMP) stars of type CEMP-s and CEMP-rs and determine their NLTE abundances of Ba and Eu, as well as the fract…
Barium isotopic ratios in metal-poor stars: calibrating the method with globular clusters
Riano E. Giribaldi, Laura Magrini, Jose Schiappacasse-Ulloa +2
Identifying the nucleosynthesis processes behind heavy-element enrichment in stellar atmospheres is challenging. It typically relies on comparing observed abundance-to-iron ratios…
Titans metal-poor reference stars II. Red giants and CEMP stars
Riano E. Giribaldi, Sophie Van Eck, Thibault Merle +6
Representative samples of F-, G-, K-type stars located out of the Solar Neighbourhood has started to be available in spectroscopic surveys. The fraction of metal-poor ([Fe/H]~$\les…
Detecting weak beryllium lines with CUBES
Rodolfo Smiljanic, Andre Rodrigo da Silva, Riano E. Giribaldi
Beryllium is a light element with one single stable isotope, 9Be, which is a pure product of cosmic-ray spallation in the interstellar medium. Beryllium abundances in late-type sta…
Beryllium abundances in turn-off stars of globular clusters with the CUBES spectrograph
Riano E. Giribaldi, Rodolfo Smiljanic
Globular clusters host multiple stellar populations that display star-to-star variation of light elements that are affected by hot hydrogen burning (e.g., He, C, N, O). Several sce…
M dwarf spectral indices at moderate resolution: accurate and [Fe/H] for 178 southern stars
E. Costa-Almeida, G. F. Porto de Mello, R. E. Giribaldi +2
We present a spectroscopic and photometric calibration to derive effective temperatures and metallicities [Fe/H] for M dwarfs, based on a Principal Component Ana…
Titans metal-poor reference stars. I. Accurate effective temperatures and surface gravities for dwarfs and subgiants from 3D non-LTE H profiles and Gaia parallaxes
Riano E. Giribaldi, André R. da Silva, Rodolfo Smiljanic +1
Several large stellar spectroscopic surveys are producing overwhelming amounts of data that can be used for determining stellar atmospheric parameters and chemical abundances. None…
Faint solar analogs: at the limit of no reddening
Riano E. Giribaldi, Gustavo F. Porto de Mello, Diego Lorenzo-Oliveira +2
The flux distribution of solar analogs is required for calculating the spectral albedo of Solar System bodies such as asteroids and trans-Neptunian objects. Ideally a solar analog…
Accurate effective temperature from H profiles
Riano E. Giribaldi, Maria L. Ubaldo-Melo, Gustavo F. Porto de Mello +4
The determination of stellar effective temperature () in F, G, and K stars using H profile fitting is a quite remarkable and powerful tool, because it practica…