Monday.
1506.07891
Discovery of low-metallicity stars in the central parsec of the Milky Way
Do, et al
Wide variety of metallicity, with 6% of the stars (out of 83 late-type giants) within the central 1pc of the MW, have [M/H]<-0.5, in contrast to previous observations. These low metallicity stars are consistent with that of globular clusters in the MW, but their small fraction likely means that globular cluster infall is not the dominant mechanism for forming the MW nuclear star cluster. The majority of stars are at or above solar metallicity, which suggests they were formed closer to the Galactic center or from the disk. In addition, the results indicate that it will be important for star formation history analyses using red giants at the Galactic center to consider the effect of varying metallicity.
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