We propose a wide and deep narrow-band photometry for the tidal stream associated with the M92 globular cluster. The combination of the NB395 and NB430 filters (PI: M. Chiba) will be used to estimate photometric [Fe/H] and [C/Fe] metallicity in the wide-fields of M92 and its stream. In particular, the metallicity index, 1.5(g−i)−(NB395−g), provides a diagnostic to extract candidate stream member stars by eliminating the majority of contaminating field Milky Way stars. In addition, the color index, 0.5(g−i)−(NB430−g), allows us to unveil the spatial dependence of carbon abundance in large areas of M92. By these narrow-bands, we will investigate the true morphology and chemical abundance of M92 and its streams, overcoming uncertainties for the first time.
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