79 citations · 1.2k across the 49 of their papers we have counts for
25 papers · 1 filter
Infrared variability of young solar analogs in the Lagoon Nebula
C. Ordenes-Huanca, M. Zoccali, A. Bayo +9
T Tauri stars are low-mass pre-main sequence stars that are intrinsically variable. Due to the intense magnetic fields they possess, they develop dark spots on their surface that,…
The VVV survey: Long-period variable stars I. Photometric catalog of ten VVV/OGLE tiles
F. Nikzat, C. E. Ferreira Lopes, M. Catelan +7
Long-period variable stars (LPVs) are pulsating red giants, primarily in the asymptotic giant branch phase, and they include both Miras and semi-regular variables (SRVs). Their per…
Variable stars in the VVV globular clusters. II. NGC6441, NGC6569, NGC6626 (M28), NGC6656 (M22), 2MASS-GC02, and Terzan10
Javier Alonso-García, Leigh C. Smith, Márcio Catelan +18
The Galactic globular clusters (GGCs) located in the inner regions of the Milky Way suffer from high extinction that makes their observation challenging. The VVV survey provides a…
The RR Lyrae projected density distribution from the Galactic centre to the halo
Maria Gabriela Navarro, Dante Minniti, Roberto Capuzzo-Dolcetta +4
The projected density distribution of type ab RR Lyrae (RRab) stars was characterised from the innermost regions of the Milky Way to the halo, with the aim of placing constraints o…
Type II Cepheids as stellar tracers and distance indicators
Anupam Bhardwaj, Vittorio F. Braga, Dante Minniti +2
Type II Cepheids are both useful distance indicators and tracers of old age stellar populations in their host galaxy. We summarize near-infrared observations of type II Cepheids in…
VVV Survey Microlensing: the Galactic Latitude Dependence
Maria Gabriela Navarro, Dante Minniti, Joyce Pullen +1
We search for microlensing events in fields along the Galactic minor axis, ranging from the Galactic center to -3.7<b< 3.9 deg., using the VVV survey near-IR photometry. The new se…
The asymptotic evolution of the stellar merger V1309 Sco: a Blue Straggler in the making?
Thiago Ferreira, Roberto K. Saito, Dante Minniti +4
Stellar mergers are estimated to be common events in the Galaxy. The best studied stellar merger case to date is V1309 Sco (= Nova Scorpii 2008) which was originally misclassified…
New variable stars in NGC 6652 and its background Sagittarius stream
Ricardo Salinas, A. Katherina Vivas, Rodrigo Contreras Ramos
We conducted a variable star search on the metal-rich Galactic globular cluster NGC 6652 using archival Gemini-S/GMOS data. We report the discovery of nine new variable stars in th…
unVEil the darknesS of The gAlactic buLgE (VESTALE)
G. Bono, M. Dall'Ora, M. Fabrizio +55
The main aim of this experiment is to provide a complete census of old (t > 10 Gyr, RR Lyrae, type II Cepheids, red horizontal branch), intermediate age (red clump, Miras) and youn…
VVV Survey Microlensing Events in the Galactic Center Region
María Gabriela Navarro, Dante Minniti, Rodrigo Contreras Ramos
We search for microlensing events in the highly reddened areas surrounding the Galactic center using the near-IR observations with the VISTA Variables in the Vía Láctea Survey (VVV…
Pulsating stars in Centauri: Near-IR properties and period-luminosity relations
Camila Navarrete, Márcio Catelan, Rodrigo Contreras Ramos +4
Centauri (NGC~5139) contains many variable stars of different types, including the pulsating type II Cepheids, RR Lyrae and SX Phoenicis stars. We carried out a deep, wide-fiel…
Near-IR period-luminosity relations for pulsating stars in Centauri (NGC 5139)
C. Navarrete, M. Catelan, R. Contreras Ramos +4
Centauri (NGC 5139) hosts hundreds of pulsating variable stars of different types, thus representing a treasure trove for studies of their corresponding period-luminosity (PL)…
An AO-assisted variability study of four globular clusters
R. Salinas, R. Contreras Ramos, J. Strader +4
The image subtraction technique applied to study variable stars in globular clusters represented a leap in the number of new detections, with the drawback that many of these new li…
Multiple stellar populations in the globular cluster M3 (NGC 5272): a Strömgren perspective
Davide Massari, Emilio Lapenna, Angela Bragaglia +3
We present Strömgren photometry of the Galactic Globular Cluster M3 to study its multiple generations phenomenon. The use of different colour-magnitude diagrams and especially of t…
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…
VVV Survey Observations of a Microlensing Stellar Mass Black Hole Candidate in the Field of the Globular Cluster NGC 6553
D. Minniti, R. Contreras Ramos, J. Alonso-Garcia +7
We report the discovery of a large timescale candidate microlensing event of a bulge stellar source based on near-infrared observations with the VISTA Variables in the Via Lactea S…
An Updated Census of RR~Lyrae Stars in the Globular Cluster ~Centauri (NGC\,5139)
C. Navarrete, R. Contreras Ramos, M. Catelan +7
[ABRIDGED] Centauri (NGC 5139) contains large numbers of variable stars of different types and, in particular, more than a hundred RR Lyrae stars. We have conducted a variabili…
Bulge RR Lyrae stars in the VVV tile
F. Gran, D. Minniti, R. K. Saito +5
The VISTA Variables in the Vía Láctea (VVV) Survey is one of the six ESO public surveys currently ongoing at the VISTA telescope on Cerro Paranal, Chile. VVV uses near-IR ($ZYJHK_{…
Variable stars in the VVV globular clusters. I. 2MASS-GC02 and Terzan10
Javier Alonso-García, István Dékány, Márcio Catelan +5
The VISTA Variables in the Via Lactea (VVV) ESO Public Survey is opening a new window to study the inner Galactic globular clusters using their variable stars. These globular clust…
The VVV Templates Project. Towards an Automated Classification of VVV Light-Curves. I. Building a database of stellar variability in the near-infrared
R. Angeloni, R. Contreras Ramos, M. Catelan +50
Context. The Vista Variables in the Vía Láctea (VVV) ESO Public Survey is a variability survey of the Milky Way bulge and an adjacent section of the disk carried out from 2010 on E…
Stellar Variability in the VVV survey
M. Catelan, D. Minniti, P. W. Lucas +34
The Vista Variables in the Vía Láctea (VVV) ESO Public Survey is an ongoing time-series, near-infrared (IR) survey of the Galactic bulge and an adjacent portion of the inner disk,…
BSS populations from the WFPC2 UV Survey
N. Sanna, R. Contreras Ramos
We have used a combination of high-resolution Hubble Space Telescope WFPC2 and wide-field ground-based observations in ultraviolet and optical bands to study the BSS population of…
Variable stars in the globular cluster M28 (NGC 6626)
G. Prieto, M. Catelan, R. Contreras Ramos +3
We present a new search for variable stars in the Galactic globular cluster M28 (NGC 6626). The search is based on a series of BVI images obtained with the SMARTS Consortium's 1.3m…
Chemical and kinematical properties of BSSs and HB stars in NGC 6397
L. Lovisi, A. Mucciarelli, B. Lanzoni +4
We used three sets of high-resolution spectra acquired with the multifiber facility FLAMES at the Very Large Telescope of the European Southern Observatory to investigate the chemi…