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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…
Abundances and physical parameters for stars in the open clusters NGC 5822 and IC 4756
G. Pace, J. Danziger, G. Carraro +5
Classical chemical analyses may be affected by systematic errors that would cause observed abundance differences between dwarfs and giants. For some elements, however, the abundanc…
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…