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The southern leading and trailing wraps of the Sagittarius tidal stream around the globular cluster Whiting1
Julio A. Carballo-Bello, Jesus M. Corral-Santana, David Martinez-Delgado +6
We present a study of the kinematics of 101 stars observed with VIMOS around Whiting1, a globular cluster embedded in the Sagittarius tidal stream. The obtained velocity distributi…
A fork in the Sagittarius trailing debris
Camila Navarrete, Vasily Belokurov, Sergey E. Koposov +4
We take advantage of the deep and wide coverage of the VST ATLAS survey to study the line-of-sight structure of the Sagittarius stellar stream in the Southern hemisphere, only ~40°…
New R Coronae Borealis and DY Persei Candidates in the SMC
F. Nikzat, M. Catelan
We report 3 new R Coronae Borealis and 63 new DY Persei candidates in the Small Magellanic Cloud. Our analysis, based on data published by the OGLE team, consisted in a search for…
A machine learned classifier for RR Lyrae in the VVV survey
Felipe Elorrieta, Susana Eyheramendy, Andrés Jordán +10
Variable stars of RR Lyrae type are a prime tool to obtain distances to old stellar populations in the Milky Way, and one of the main aims of the Vista Variables in the Via Lactea…
Variable Stars in the Quintuplet stellar cluster with the VVV Survey
C. Navarro Molina, J. Borissova, M. Catelan +7
The Quintuplet cluster is one of the most massive star clusters in the Milky Way, situated very close to the Galactic center. We present a new search for variable stars in the vici…
Constraints on the Distance Moduli, Helium and Metal Abundances, and Ages of Globular Clusters from their RR Lyrae and Non-Variable Horizontal-Branch Stars. I. M3, M15, and M92
Don A. VandenBerg, Pavel A. Denissenkov, Marcio Catelan
Up-to-date isochrones, zero-age horizontal branch (ZAHB) loci, and evolutionary tracks for core He-burning stars are applied to the color-magnitude diagrams (CMDs) of M3, M15, and…
Near-Field cosmology with RR Lyrae variable stars: A first view of substructure in the southern sky
S. Duffau, A. K. Vivas, C. Navarrete +7
We present an update of a spectroscopic follow-up survey at low-resolution of a large number of RR Lyrae halo overdensity candidates found in the southern sky. The substructure can…
The Araucaria Project. On the Tip of the Red Giant Branch distance determination to the Magellanic Clouds
Marek Gorski, Grzegorz Pietrzynski, Wolfgang Gieren +8
We present a precise optical and near-infrared determination of the Tip of the Red Giant Branch (TRGB) brightness in the Large and Small Magellanic Clouds (respectively LMC and SMC…
Mapping the outer bulge with RRab stars from the VVV Survey
F. Gran, D. Minniti, R. K. Saito +8
The VISTA Variables in the Vía Láctea (VVV) is a near-IR time-domain survey of the Galactic bulge and southern plane. One of the main goals of this survey is to reveal the 3D struc…
Pulsating hot O subdwarfs in Omega Cen: mapping a unique instability strip on the Extreme Horizontal Branch
S. K. Randall, A. Calamida, G. Fontaine +10
We present an extensive survey for rapid pulsators among Extreme Horizontal Branch (EHB) stars in omega Cen. The observations performed consist of nearly 100 hours of time-series p…
Level of helium enhancement among M3's horizontal-branch stars
A. A. R. Valcarce, M. Catelan, J. Alonso-García +2
(Abridged) The color and luminosity distribution of horizontal branch (HB) stars in globular clusters are sensitive probes of their original helium abundances. However, recent anal…