New HST WFC3/UVIS observations augment the stellar-population complexity of omega Centauri

2); (2) STScI; 3); (3) Univ. Catolica Chile; (4) Univ. Concepcion Chile); Bedin L. R. (2); Bellini A. (1; Marino A. F. (1; Milone A. P. (1); Piotto G. (1)

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New HST WFC3/UVIS observations augment the stellar-population complexity of omega Centauri

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arxiv 1006.4157 v1 pith:HIIFWY77 submitted 2010-06-21 astro-ph.GA

Bellini A. (1 , 2) , Bedin L. R. (2) , Piotto G. (1) , Milone A. P. (1) , Marino A. F. (1 , 3) , Villanova S. (4) ((1) Univ. Padova

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(2) STScI (3) Univ. Catolica Chile (4) Univ. Concepcion Chile)

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We used archival multi-band Hubble Space Telescope observations obtained with the Wide-Field Camera 3 in the UV-optical channel to present new important observational findings on the color-magnitude diagram (CMD) of the Galactic globular cluster omega Centauri. The ultraviolet WFC3 data have been coupled with available WFC/ACS optical-band data. The new CMDs, obtained from the combination of colors coming from eight different bands, disclose an even more complex stellar population than previously identified. This paper discusses the detailed morphology of the CMDs.

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