White Dwarfs in Omega Centauri: Preliminary Evidence

Details White Dwarfs in Omega Centauri: Preliminary Evidence White Dwarfs in Omega Centauri: Preliminary Evidence

2005-01-21

arxiv.org/abs/astro-ph/0501462v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present accurate and deep multiband B,R,Halpha data for the globular cluster Omega Cen collected with the Advanced Camera for Surveys on HST. The photometric catalogue includes more than one million stars. By adopting severe selection criteria we identified more than 600 bona fide White Dwarfs (WDs). Empirical evidence suggests that a small sample of WDs are Halpha-bright. The comparison between WD isochrones and observations shows a reasonable agreement at fainter magnitudes and a mismatch at the brighter ones.

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