691 citations · 1.6k across the 6 of their papers we have counts for
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The double Subgiant Branch of NGC 1851: the role of the CNO abundance
S. Cassisi, M. Salaris, A. Pietrinferni +4
We explore the possibility that the anomalous split in the Subgiant branch of the galactic globular cluster NGC 1851 is due to the presence of two distinct stellar populations with…
A Triple Main Sequence in the Globular Cluster NGC 2808
G. Piotto, L. R. Bedin, J. Anderson +6
Accurate photometry with HST/ACS shows that the main sequence of the globular cluster NGC 2808 splits into three separate branches. The three MS branches may be associated with com…
The multiplicity of the subgiant branch of Omega Centauri: Evidence for prolonged star formation
S. Villanova, G. Piotto, I. R. King +9
We present metallicity measurements based on GIRAFFE@VLT spectra of 80 subgiant-branch stars of the Galactic globular cluster Omega Centauri. The VLT spectroscopic data are complem…
The Distance to the Isolated Neutron Star RX J0720.4-3125
D. L. Kaplan, M. H. van Kerkwijk, J. Anderson
We have used a set of dedicated astrometric data from the Hubble Space Telescope to measure the parallax and proper motion of the nearby neutron star RX J0720.4-3125. At each of ei…