Stellar metallicities from SkyMapper photometry I: A study of the Tucana
  II ultra-faint dwarf galaxy
  We present a study of the ultra-faint Milky Way dwarf satellite galaxy Tucana
II using deep photometry from the 1.3m SkyMapper telescope at Siding Spring
Observatory, Australia. The SkyMapper filter-set contains a
metallicity-sensitive intermediate-band $v$ filter covering the prominent Ca II
K feature at 3933.7A. When combined with photometry from the SkyMapper $u, g$,
and $i$ filters, we demonstrate that $v$ band photometry can be used to obtain
stellar metallicities with a precision of $\sim0.20$dex when [Fe/H] $> -2.5$,
and $\sim0.34$dex when [Fe/H] $< -2.5$. Since the $u$ and $v$ filters bracket
the Balmer Jump at 3646A, we also find that the filter-set can be used to
derive surface gravities. We thus derive photometric metallicities and surface
gravities for all stars down to a magnitude of $g\sim20$ within $\sim$75
arcminutes of Tucana II. Photometric metallicity and surface gravity cuts
remove nearly all foreground contamination. By incorporating Gaia proper
motions, we derive quantitative membership probabilities which recover all
known members on the red giant branch of Tucana II. Additionally, we identify
multiple likely new members in the center of the system and candidate members
several half-light radii from the center of the system. Finally, we present a
metallicity distribution function derived from the photometric metallicities of
likely Tucana II members. This result demonstrates the utility of wide-field
imaging with the SkyMapper filter-set in studying UFDs, and in general, low
surface brightness populations of metal-poor stars. Upcoming work will clarify
the membership status of several distant stars identified as candidate members
of Tucana II.
