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

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

2010-06-21

arxiv.org/abs/1006.4157v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

17 pages, 14 figures (11 in low res), 3 tables. Accepted for publication in AJ on June 19, 2010

Scientific paper

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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