Showing astro-phShow all
3 papers · 1 filter
astro-ph2001
The Field population towards NGC 6553
A. Vallenari, S. Ortolani
We analyze the colour magnitude diagram of the field population in the direction of the bulge cluster NGC 6553 to discuss the stellar field component projected towards the cluster.…
astro-ph1998
Bright Stars and Metallicity Spread in the Globular Cluster Omega Centauri
Sergio Ortolani, Stefano Covino, Giovanni Carraro
The globular cluster Omega Centauri (NGC 5139) is the most massive and brightest cluster in our Galaxy. It has also a moderately high mass to light ratio (3.6) and an anomalous fla…
astro-ph1996
The White Dwarf Distance to the Globular Cluster NGC 6752 (and its Age) with the Hubble Space Telescope (Based on observations made with the NASA/ESA Hubble Space Telescope (HST))
Alvio Renzini, Angela Bragaglia, Francesco R. Ferraro +6
Deep Hubble Space Telescope (HST) observations with WFPC2 of the nearby globular cluster NGC 6752 have allowed us to obtain accurate photometry for the cluster white dwarfs (WD). A…