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Sandford, Nicolas Longeard, Nicolas Martin, Patrick C\\^ot\\'e, Sal Wanying Fu","submitted_at":"2024-07-05T17:59:12Z","abstract_excerpt":"We present $\\sim300$ stellar metallicity measurements in two faint M31 dwarf galaxies, Andromeda XVI ($M_V = -7.5$) and Andromeda XXVIII ($M_V = -8.8$) derived using metallicity-sensitive Calcium H & K narrow-band Hubble Space Telescope imaging. These are the first individual stellar metallicities in And~XVI (95 stars). Our And~XXVIII sample (191 stars) is a factor of $\\sim15$ increase over literature metallicities. 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