125 citations · 819 across the 25 of their papers we have counts for
26 papers
Reconstructing the Disrupted Dwarf Galaxy -Sausage/Enceladus Using its Stars and Globular Clusters
Guilherme Limberg, Stefano O. Souza, Angeles Pérez-Villegas +3
We combine spectroscopic, photometric, and astrometric information from APOGEE data release 17 and early data release 3 to perform a self-consistent characterization of $Gai…
The VISCACHA survey -- IV. The SMC West Halo in 8D
B. Dias, M. C. Parisi, M. Angelo +18
The structure of the Small Magellanic Cloud (SMC) is very complex, in particular in the periphery that suffers more from the interactions with the Large Magellanic Cloud (LMC). A w…
Orbits of globular clusters computed with dynamical friction in the Galactic anisotropic velocity dispersion field
Edmundo Moreno, José G. Fernández-Trincado, Angeles Pérez-Villegas +2
We present a preliminary analysis of the effect of dynamical friction on the orbits of part of the globular clusters in our Galaxy. Our study considers an anisotropic velocity disp…
Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters
R. A. P. Oliveira, S. Ortolani, B. Barbuy +6
Context. RR Lyrae stars are useful standard candles allowing one to derive accurate distances for old star clusters. Based on the recent catalogues from OGLE-IV and Gaia Early Data…
Kinematic footprint of the Milky Way spiral arms in Gaia EDR3
Luis Martinez-Medina, Angeles Pérez-Villegas, Antonio Peimbert
The Milky Way spiral arms are well established from star counts as well as from the locus of molecular clouds and other young objects, however, they have only recently started to b…
Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6
Stefano O. Souza, Marica Valentini, Beatriz Barbuy +7
Palomar 6 (Pal~6) is a moderately metal-poor globular cluster projected towards the Galactic bulge. A full analysis of the cluster can give hints on the early chemical enrichment o…
Dynamics of the spiral-arm corotation and its observable footprints in the Solar Neighborhood
Douglas A. Barros, Angeles Pérez-Villegas, Tatiana A. Michtchenko +1
This article discusses the effects of the spiral-arm corotation on the stellar dynamics in the Solar Neighborhood (SN). All our results presented here rely on: 1) observational evi…
Gemini/Phoenix H-band analysis of the globular cluster AL3
B. Barbuy, H. Ernandes, S. O. Souza +9
The globular cluster AL~3 is old and located in the inner bulge. Three individual stars were observed with the Phoenix spectrograph at the Gemini South telescope. The wavelength re…
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
José G. Fernández-Trincado, Timothy C. Beers, Dante Minniti +26
The central (`bulge') region of the Milky Way is teeming with a significant fraction of mildly metal-deficient stars with atmospheres that are strongly enriched in cyanogen ($^{12}…
Aluminum Enhanced Metal-Poor Stars buried in the Inner Galaxy
José G. Fernández-Trincado, Timothy C. Beers, Dante Minniti +5
Stars with higher aluminum and nitrogen enrichment are often the key pieces for the chemical makeup of multiple populations in almost all globular clusters (GCs). There is also com…
The enigmatic globular cluster UKS~1 obscured by the bulge: \textit{H}-band discovery of nitrogen-enhanced stars
José G. Fernández-Trincado, Dante Minniti, Timothy C. Beers +13
The presence of nitrogen-enriched stars in globular clusters provides key evidence for multiple stellar populations (MPs), as has been demonstrated with globular cluster spectrosco…
Exploring the origin of moving groups and diagonal ridges by simulations of stellar orbits and birthplaces
Douglas A. Barros, Angeles Pérez-Villegas, Jacques R. D. Lépine +2
The present paper is the culminating one of a series aimed to contribute to the understanding of the kinematic structures of the solar neighbourhood (SN), explaining the origin of…
Chemodynamics of newly identified giants with globular cluster like abundance patterns in the bulge, disk, and halo of the Milky Way
José G. Fernández-Trincado, Timothy C. Beers, Baitian Tang +3
The latest edition of the APOGEE-2/DR14 survey catalogue and the first \texttt{Payne} data release of APOGEE abundance determinations by Ting et al. are examined. We identify 31 pr…
Discovery of a new stellar sub-population residing in the (inner) stellar halo of the Milky Way
José G. Fernández-Trincado, Timothy C. Beers, Vinicius M. Placco +8
We report the discovery of a unique collection of metal-poor giant-stars, that exhibit anomalously high levels of Si, clearly above typical Galactic levels. Our sample spans…
Dynamical Orbital classification of selected N-rich stars with \textit{Gaia} DR2 astrometry
José G. Fernández-Trincado, Leonardo Chaves-Velasquez, Angeles Pérez-Villegas +4
We have used the galaxy modeling algorithm \texttt{GravPot16}, to explore the more probable orbital elements of a sample of 64 selected N-rich stars across the Milky Way. Using the…
The moving groups as the origin of the vertical phase space spiral
Tatiana A. Michtchenko, Douglas A. Barros, Angeles Pérez-Villegas +1
Using the Gaia data release 2 (DR2), we analyzed the distribution of stars in the close vicinity of the Sun in the full 3D position-velocity space. We have found no evidence of inc…
Discovery of a nitrogen-enhanced mildly metal-poor binary system: Possible evidence for pollution from an extinct AGB Star
José G. Fernández-Trincado, Ronald Mennickent, Mauricio Cabezas +13
We report the serendipitous discovery of a nitrogen-rich, mildly metal-poor ([Fe/H]=-1.08) giant star in a single-lined spectroscopic binary system found in the SDSS-IV Apache Poin…
High-resolution abundance analysis of four red giants in the globular cluster NGC 6558
B. Barbuy, L. Muniz, S. Ortolani +8
NGC 6558 is a bulge globular cluster with a blue horizontal branch (BHB), combined with a metallicity of [Fe/H]~-1.0. It is similar to HP 1 and NGC 6522, which could be among the o…
On the stellar velocity distribution in the solar neighborhood in the light of Gaia DR2
Tatiana A. Michtchenko, Jacques R. D. Lépine, Angeles Pérez-Villegas +2
The aim of this work is to contribute to the understanding of the stellar velocity distribution in the solar neighborhood (SN). We propose that the structures on the planes,…
A chemical and kinematical analysis of the intermediate-age open cluster IC 166 from APOGEE and Gaia DR2
J. Schiappacasse-Ulloa, B. Tang, J. G. Fernández-Trincado +26
IC 166 is an intermediate-age open cluster ( Gyr) which lies in the transition zone of the metallicity gradient in the outer disc. Its location, combined with our very limi…
MHD simulations of ram pressure stripping of a disk galaxy
Mariana Ramos-Martínez, Gilberto C. Gómez, Angeles Pérez-Villegas
The removal of the interstellar medium (ISM) of disk galaxies through ram pressure stripping (RPS) has been extensively studied in numerous simulations. Nevertheless, the role of m…
The Hercules stream as seen by APOGEE-2 South
Jason A. S. Hunt, Jo Bovy, Angeles Pérez-Villegas +15
The Hercules stream is a group of co-moving stars in the Solar neighbourhood, which can potentially be explained as a signature of either the outer Lindblad resonance (OLR) of a fa…
New insights on the origin of the High Velocity Peaks in the Galactic Bulge
J. G. Fernández-Trincado, A. C. Robin, E. Moreno +2
We provide new insight on the origin of the cold high-V peaks (200 kms) in the Milky Way bulge discovered in the APOGEE commissioning data \citep{Nidever20…
Revisiting the Tale of Hercules: how stars orbiting the Lagrange points visit the Sun
Angeles Pérez-Villegas, Matthieu Portail, Christopher Wegg +1
We propose a novel explanation for the Hercules stream consistent with recent measurements of the extent and pattern speed of the Galactic bar. We have adapted a made-to-measure dy…