844 citations · 5.1k across the 47 of their papers we have counts for
6 papers · 2 filters
Granulation signatures in the spectrum of the very metal-poor red giant HD122563
I. Ramirez, R. Collet, D. L. Lambert +2
A very high resolution (R=200,000), high signal-to-noise ratio (S/N=340) blue-green spectrum of the very metal-poor ([Fe/H]=-2.6) red giant star HD122563 has been obtained by us at…
A possible signature of terrestrial planet formation in the chemical composition of solar analogs
I. Ramirez, M. Asplund, P. Baumann +2
Recent studies have shown that the elemental abundances in the Sun are anomalous when compared to most (about 85%) nearby solar twin stars. Compared to its twins, the Sun exhibits…
uvby- photometry of solar twins: the solar colors, model atmospheres, and the Teff and metallicity scales
J. Melendez, W. J. Schuster, J. S. Silva +3
Solar colors have been determined on the uvby- photometric system to test absolute solar fluxes, to examine colors predicted by model atmospheres as a function of stellar parame…
Observational evidence for a broken Li Spite plateau and mass-dependent Li depletion
Jorge Melendez, Luca Casagrande, Ivan Ramirez +2
We present NLTE Li abundances for 88 stars in the metallicity range -3.5 < [Fe/H] < -1.0. The effective temperatures are based on the infrared flux method with improved E(B-V) valu…
An absolutely calibrated effective temperature scale from the InfraRed Flux Method
L. Casagrande, I. Ramirez, J. Melendez +2
Various effective temperature scales have been proposed over the years. Despite much work and the high internal precision usually achieved, systematic differences of order 100 K (o…
Chemical similarities between Galactic bulge and local thick disk red giants: O, Na, Mg, Al, Si, Ca and Ti
A. Alves-Brito, J. Melendez, M. Asplund +2
... We confirm the well-established differences for [/Fe] at a given metallicity between the local thin and thick disks. For all the elements investigated, we find no chemical d…