Fig. A.2.
Additional cluster supergiants (black) which lack He II 2.189 μm photospheric absorption. Overplotted in blue are the spectra of two cluster O9–B0Ia stars suggesting comparable classifications for LHO33, −41, −128 and −132. The lower S/N of the remaining objects results in a generic OB star classification. HST/NICMOS F205W magnitudes are given in parentheses (Table A.1).
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