Sextans A U−B vs. Q diagram. The black dots mark the stars from the photometric catalog of Massey et al. (2007). Other colors and symbols represent the spectral classifications assigned in this work, as listed in the legend. The mean error bars for the program stars are shown in the upper left corner. The shaded boxes indicate the location of IC 1613’s O (orange) and B (gray filled with parallel lines) stars in the diagram (see GH13). The O-stars of Sextans A are offset toward bluer colors from the box of IC 1613 O-stars.
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