Spectroscopic observations of AB supergiants in M 33.
We have observed 10 luminous blue stars in M 33 at intermediate dispersion and have determined spectral types and luminosity classes from the blue and red spectrograms by comparing with galactic and SMC stars. Halpha_ profiles have proved to be very useful in disentangling luminosity and metallicity effects, and constitute a valuable diagnostic
Monteverde, M. I. et al.
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1996