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8 papers · 2 filters
VVV Survey Near-Infrared Photometry of Known Bulge RR Lyrae stars: the Distance to the Galactic Center and Absence of a Barred Distribution of the Metal-Poor Population
I. Dékány, D. Minniti, M. Catelan +4
We have combined optical and near-infrared data of known RR Lyrae (RRL) stars in the bulge in order to study the spatial distribution of its metal-poor component by measuring preci…
Discovery of New Companions to High Proper Motion Stars from the VVV Survey
Valentin D. Ivanov, Dante Minniti, Maren Hempel +14
[abridged] The severe crowding in the direction of the inner Milky Way suggests that the census of stars within a few tens of parsecs in that direction may not be complete. We sear…
Time-Series BVI Photometry for the Globular Cluster NGC 6981 (M72)
P. Amigo, P. B. Stetson, M. Catelan +2
We present new BVI photometry of the globular cluster NGC 6981 (M72), based mostly on ground-based CCD archive images. We present a new color-magnitude diagram (CMD) that reaches a…
Searching for variable stars in the VVV globular clusters
Javier Alonso-García, István Dékány, Márcio Catelan +2
The VVV is currently surveying the central regions of the Milky Way at near-infrared wavelengths, including 36 known Galactic globular clusters. We already have data in several fil…
Evidence for a Milky Way Tidal Stream Reaching Beyond 100 kpc
A. J. Drake, M. Catelan, S. G. Djorgovski +9
We present the analysis of 1,207 RR Lyrae found in photometry taken by the Catalina Survey's Mount Lemmon telescope. By combining accurate distances for these stars with measuremen…
Does the Oosterhoff Dichotomy Exist in The Andromeda Galaxy? I. The case of G11
Rodrigo Contreras Ramos, Gisella Clementini, Luciana Federici +8
We present the first evidence that Oosterhoff type II globular clusters exist in the Andromeda galaxy (M31). On the basis of time-series photometry of the moderately metal-poor ([F…
NGC5694: another extra-galactic globular cluster
A. Mucciarelli, M. Bellazzini, M. Catelan +5
We discuss the chemical composition of six giant stars of the outer Halo globular cluster NGC5694, through the analysis of UVES@FLAMES high-resolution spectra. The cluster has an a…
Multiple populations in Galactic globular clusters: a survey in the Strömgren system
J. Alonso-García, M. Catelan, P. Amigo +10
We are coming to believe that stellar populations in globular clusters are not as simple as they were once thought to be. A growing amount of photometric and spectroscopic evidence…