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.

Monelli, M., Corsi, C.e., Castellani, V., Ferraro, I., Iannicola, G., Prada Moroni, P.g., et al. (2005). The discovery of more than 2000 white dwarfs in the globular cluster omega Centauri. THE ASTROPHYSICAL JOURNAL LETTERS, 621, 117-120 [10.1086/429255].

The discovery of more than 2000 white dwarfs in the globular cluster omega Centauri

BONO, GIUSEPPE;BUONANNO, ROBERTO;
2005-01-01

Abstract

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.
2005
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Globular clusters: General; Globular clusters: Individual (ω centauri)
Monelli, M., Corsi, C.e., Castellani, V., Ferraro, I., Iannicola, G., Prada Moroni, P.g., et al. (2005). The discovery of more than 2000 white dwarfs in the globular cluster omega Centauri. THE ASTROPHYSICAL JOURNAL LETTERS, 621, 117-120 [10.1086/429255].
Monelli, M; Corsi, Ce; Castellani, V; Ferraro, I; Iannicola, G; Prada Moroni, Pg; Bono, G; Buonanno, R; Calamida, A; Freyhammer, Lm; Pulone, L; Stetson, Pb
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/56166
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