415 citations · 904 across the 21 of their papers we have counts for
7 papers · 1 filter
Abundance variations in the globular cluster M71 (NGC 6838)
A. Alves-Brito, R. P. Schiavon, B. Castilho +1
Abundance variations in moderately metal-rich globular clusters can give clues about the formation and chemical enrichment of globular clusters. CN, CH, Na, Mg and Al indices in sp…
H-delta in the Integrated Light of Galaxies: What Are We Actually Measuring?
L. C. Prochaska, J. A. Rose, N. Caldwell +5
We present a cautionary study exploring the reliability of the H-delta line in the integrated spectra of galaxies for determining galaxy ages. Our database consists of the observed…
Polarimetry of Li-rich giants
A. Pereyra, B. V. Castilho, A. M. Magalhaes
Protoplanetary nebulae typically present non-spherical envelopes. The origin of such geometry is still controversial. There are indications that it may be carried over from an earl…
A library of high resolution synthetic stellar spectra from 300nm to 1.8 micron with solar and alpha-enhanced composition
P. Coelho, B. Barbuy, J. Melendez +2
Libraries of stellar spectra are fundamental tools for the study of stellar populations and both empirical and synthetic libraries have been used for this purpose. In this paper, a…
Detailed Analysis of Nearby Bulgelike Dwarf Stars II. Lithium Abundances
Luciana Pompeia, Beatriz Barbuy, Michel Grenon +1
Li abundances are derived for a sample of bulgelike stars with isochronal ages of 10-11 Gyr. These stars have orbits with pericentric distances, Rp, as small as 2-3 kpc and Zmax <…
Chromospherically young, kinematically old stars
H. J. Rocha-Pinto, B. V. Castilho, W. J. Maciel
We have investigated a group of stars known to have low chromospheric ages, but high kinematical ages. Isochrone, chemical and lithium ages are estimated for them. The majority of…