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Spectroscopic search for binaries among EHB stars in globular clusters
C. Moni Bidin, R. A. Mendez, S. Moehler +3
We performed a spectroscopic search for binaries among hot Horizontal Branch stars in globular clusters. We present final results for a sample of 51 stars in NGC6752, and prelimina…
Multivariate Analysis of Globular Cluster's Horizontal Branch Morphology: searching for the second parameter
A. Recio-Blanco, A. Aparicio, G. Piotto +2
The interpretation of globular cluster horizontal branch (HB) morphology is a classical problem that can significantly blur our understanding of stellar populations. In this paper,…
Precise reddening and metallicity of NGC6752 from FLAMES spectra
R. G. Gratton, A. Bragaglia, E. Carretta +5
(abridged) Accurate reddenings for Globular Clusters could be obtained by comparing the colour-temperature obtained using temperatures from reddening-free indicator (Halpha), with…
Color--Magnitude Diagrams and Luminosity Functions down to the Hydrogen Burning Limit. III. A Preliminary HST Study of NGC6791
I. R. King, L. R. Bedin, G. Piotto +3
Using HST ACS/WFC images, we derive the color--magnitude diagram of the old, metal-rich open cluster NGC 6791 to nearly 29th magnitude in V, which is the neighborhood of the hydrog…
Star-Cluster Astrometry with Ground-Based Wide Field Imagers
L. R. Bedin, J. Anderson, G. Piotto +2
We show the astrometric potential of the Wide Field Imager at the focus of the MPI-ESO 2.2m Telescope. Currently, we are able to measure the position of a well-exposed star with a…
Luminosity and mass functions of galactic open clusters: II. NGC 4852
Giovanni Carraro, Gustavo Baume, Giampaolo Piotto +2
e present wide field deep UBVI photometry for the previously unstudied open cluster NGC 4852 down to a limiting magnitude , obtained from observations taken with the Wide…