Spectroscopic observations of AB supergiants in M 33.

Details Spectroscopic observations of AB supergiants in M 33. Spectroscopic observations of AB supergiants in M 33.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312...24m&link_type=abstract

Astronomy and Astrophysics, v.312, p.24-32

Astronomy and Astrophysics

Astrophysics

23

Stars: Early Types, Stars: Supergiants, Galaxies: Individual: M 33, Galaxies: Stellar Content

Scientific paper

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 when comparing spectral classifications in galaxies with different metallicities. We derive qualitative estimates of the stellar metallicities which range from solar to SMC-like and are broadly consistent with abundance gradient results obtained for M 33 from Hii region studies. Comparison of the new data for B 324 with previous work shows that there is evidence for significant spectral variability strongly suggesting an LBV nature for this star.

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