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Probing the nature of Possible Open Cluster Remnants with the Southern Proper Motion Program
Giovanni Carraro, Dana Dinescu, Terrence Girard +1
We discuss the nature of eleven Possible Open Cluster Remnants (POCRs) by using absolute proper motions from the Southern Proper Motion (SPM) Program 3 (Girard et al. 2004) combine…
Metallicities on the Double Main Sequence of omega Centauri Imply Large Helium Enhancement
Giampaolo Piotto, Sandro Villanova, Luigi R. Bedin +10
Having shown in a recent paper that the main sequence of omega Centauri is split into two distinct branches, we now present spectroscopic results showing that the bluer sequence is…
Using globular clusters to test gravity in the weak acceleration regime: NGC 6171
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi
As part of an ongoing program to test Newton's law of gravity in the low acceleration regime using globular clusters, we present here new results obtained for NGC 6171. Combining V…
NGC 6404 and NGC 6583: two neglected intermediate-age open clusters located in the Galactic Center direction
Giovanni Carraro, Rene Mendez, Edgardo Costa
We report on CCD photometry of two fields centered in the region of the open clusters NGC 6404 and NGC 6583 down to . These clusters have never been studied insofar, a…
NGC 5385, NGC 2664 and Collinder 21: three candidate Open Cluster Remnants
Sandro Villanova, Giovanni Carraro, Raul de la Fuente Marcos +1
We present CCD UBVI photometric and medium/high resolution spectroscopic observations obtained in the field of the previously unstudied dissolving open cluster candidates NGC 5385,…
Metal abundances in extremely distant Galactic old open clusters. I. Berkeley 29 and Saurer 1
Giovanni Carraro, Fabio Bresolin, Sandro Villanova +3
We report on high resolution spectroscopy of four giant stars in the Galactic old open clusters Berkeley~29 and Saurer~1 obtained with HIRES at the Keck telescope. These two cluste…
Omega Centauri: The Population Puzzle Goes Deeper
L. R. Bedin, G. Piotto, J. Anderson +5
We present HST observations that show a bifurcation of colors in the middle main sequence of the globular cluster Omega Centauri. We see this in three different fields, observed wi…
Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
Sandro Villanova, Gustavo Baume, Giovanni Carraro +1
We present and discuss broad band CCD photometry and low resolution spectroscopy for stars in the region of the open cluster NGC 6996, located in the North America Nebul…