volume 13, issue S334, P290-291 2017
DOI: 10.1017/s1743921317007074
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C. Gallart, G. Fiorentino, M. Monelli, C. Martínez-Vázquez, E. J. Bernard, G. Bono, P. B. Stetson

Abstract: RR Lyrae variables are old (>10 Gyr) stars and, as such, they are useful probes of the earliest events of star formation in galaxies (Bernard et al. 2008, Martínez-Vázquez et al. 2016) as well as of the galaxy assembly process predicted by ΛCDM simulations of structure formation. In fact, the nature of the building-blocks of galaxies such as the Milky Way, and in particular, those of their stellar haloes, has been a matter of a substantial debate (Venn et al. 2004). Unlike other stellar tracers, RR Lyra…

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