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Discovery of VVV CL001. A Low-Mass Globular Cluster Next to UKS~1 in the Direction of the Galactic Bulge
D. Minniti, M. Hempel, I. Toledo +15
Context: It is not known how many globular clusters may have been left undetected towards the Galactic bulge. Aims: One of the aims of the VISTA Variables in the Via Lactea (VVV) S…
The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts
Thomas M. Brown, Kailash Sahu, Jay Anderson +14
We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST). Using ou…
Period Change Similarities among the RR Lyrae Variables in Oosterhoff I and Oosterhoff II Globular Systems
Andrea Kunder, Alistair Walker, Peter B. Stetson +9
We present period change rates (dP/dt) for 42 RR Lyrae variables in the globular cluster IC4499. Despite clear evidence of these period increases or decreases, the observed per…
Two Red Clumps and the X-Shaped Milky Way Bulge
Andrew McWilliam, Manuela Zoccali
From 2MASS infra-red photometry we find two red clump (RC) populations co-existing in the same fields toward the Galactic bulge at latitudes |b|>5.5 deg., ranging over ~13 degrees…
Low-resolution spectroscopy of main sequence stars belonging to 12 Galactic globular clusters. I. CH and CN band strength variations
E. Pancino, M. Rejkuba, M. Zoccali +1
Globular clusters show abundance variations for light elements that are not yet well understood. The preferred explanation involves a self-enrichment scenario, with two subsequent…
Open clusters towards the Galactic center: chemistry and dynamics. A VLT spectroscopic study of NGC6192, NGC6404, NGC6583
Laura Magrini, Sofia Randich, Manuela Zoccali +5
In the framework of the study of the Galactic metallicity gradient and its time evolution, we present new high-resolution spectroscopic observations obtained with FLAMES and the fi…