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Color–color diagram of the selected stars in the field of LH 91. All magnitudes are already corrected for the extinction contribution of our Galaxy, mag and E(m555 − m814)MW = 0.1. The arrow shows the reddening vector of E(m555 − m814) = 0.25 and E(m555 − m656) = 0.13 for the adopted LH 91 extinction law. The dashed line represents the median photospheric (m555 − m814) color for the 254 stars with δ555, δ814, and δ656 < 0.05 (gray filled dots). The dotted line shows the model atmospheres of Bessell et al. (1998) computed for the three WFC3/UVES filters. The PMS star candidates with Hα emission excess at the 3σ level are represented with large red dots. The large green dots are the brightest PMS star candidates, with m555 < 20 mag. Error bars are also shown.
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