119 citations · 319 across the 11 of their papers we have counts for
6 papers · 1 filter
Gaia GraL: Gaia DR2 Gravitational Lens Systems. V. Doubly-imaged QSOs discovered from entropy and wavelets
A. Krone-Martins, M. J. Graham, D. Stern +22
The discovery of multiply-imaged gravitationally lensed QSOs is fundamental to many astronomical and cosmological studies. However, these objects are rare and challenging to discov…
NGC 6845: metallicity gradients and star formation in a complex compact group
D. Olave-Rojas, S. Torres-Flores, E. R. Carrasco +3
We have obtained Gemini/GMOS spectra of 28 regions located across the interacting group NGC 6845, spanning from the inner regions of the four major galaxies (NGC 6845A, B, C, D) to…
Star-forming regions and the metallicity gradients in the tidal tails: The case of NGC 92
Sergio Torres-Flores, Sergio Scarano, Claudia Mendes de Oliveira +3
We present new Gemini/GMOS spectroscopic and archival imaging data of the interacting galaxy NGC 92, which is part of a compact group and displays an extended tidal tail. We have s…
Bimodal chemical evolution of the Galactic disk and the Barium abundance of Cepheids
Jacques R. D. Lepine, Sergei Andrievky, Douglas A. Barros +2
In order to understand the Barium abundance distribution in the Galactic disk based on Cepheids, one must first be aware of important effects of the corotation resonance, situated…
Overlapping abundance gradients and azimuthal gradients related to the spiral structure of the Galaxy
J. R. D. Lepine, P. Cruz, S. Scarano +6
The connection between some features of the metallicity gradient in the Galactic disk, best revealed by Open Clusters and Cepheids, and the spiral structure, is explored. The step-…
Breaks in the Radial Oxygen Abundance and Corotation Radius of Three Spiral Galaxies
S. Scarano, J. R. D. Lepine, M. M. Marcon-Uchida
The correlation between the breaks in the metallicity distribution and the corotation radius of spiral galaxies has been already advocated in the past and is predicted by a chemo-d…