Title: FORS2/VLT survey of Milky Way globular clusters: candidates to have origin in disrupted 
dwarf galaxies

Abstract:
The nature of globular clusters has changed in the last few decades and now we know that 
these objects present a complex chemical enrichment history as evidencied by the spread in 
light element abundances within a same cluster. A few clusters present also a spread in Fe-
peak elements, as omega Cen and M54, which indicates a complex formation scenario 
possibly by disruption of a dwarf galaxy or merger of clusters. We carried out a survey of 51 
poorly studied Milky Way globular clusters to look for more candidates to present a spread in 
Fe-peak elements. We observed spectra of ~20 red giant stars per cluster. Optical spectra 
(460-580 nm) were obtained with the FORS2@VLT/ESO, at a resolution Dl = 2.5 A. We used 
ETOILE code (Katz et al. 2011) to derive radial velocities, Teff, log(g), [Fe/H], and [Mg/Fe] for 
each star, by finding the best fitting spectrum using as reference a synthetic (Coelho et al. 
2005) and a observed stellar spectral library MILES. We found spread in [Fe/H] for the massive 
clusters M22, and NGC5824. The chemical enrichment of M22 is more similar to Milky Way 
than to dwarf galaxies, which may indicate that its origin is not in a disrupted dwarf galaxy. 
NGC5824 is located in the projected orbit of the Cetus Polar stream, which may indicate that it 
is related to a massive object captured by our Galaxy.