We present deep multiband (F435W, F625W, and F658N) photometric data of the globular cluster omega Cen collected with the Advanced Camera for Surveys on board the Hubble Space Telescope. We identified in the ( F435W - F625W, F435W)- plane more than 2000 white dwarf (WD) candidates using three out of nine available pointings. Such a large sample appears to be in agreement with predictions based on the ratio between WD and horizontal-branch evolutionary lifetimes. We also detected approximate to 1600 WDs in the ( F658N - F625W, F625W)- plane, supporting the evidence that a large fraction of current cluster WDs are H alpha-bright.
|Autori:||Monelli M; Corsi CE; Castellani V; Ferraro I; Iannicola G; Prada Moroni P; Bono G; Buonanno R; Calamida A; Freyhammer LM; Pulone L; Stetson PB|
|Titolo:||The discovery of more than 2000 white dwarfs in the globular cluster omega Centauri|
|Anno del prodotto:||2005|
|Digital Object Identifier (DOI):||10.1086/429255|
|Appare nelle tipologie:||1.1 Articolo in rivista|