Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..716w&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 716-718.
Astronomy and Astrophysics
Astrophysics
32
Abundance, Magellanic Clouds, Metallicity, Stellar Spectra, Supergiant Stars, Astronomical Catalogs, B Stars, Helium, Hydrogen, Line Spectra, O Stars, Silicon, Spectrum Analysis, Stellar Luminosity, Stellar Magnitude
Scientific paper
Detailed spectral classifications are given for nine OB supergiants in the Small Magellanic Cloud, along with less detailed remarks for an additional six objects. From the hydrogen and helium spectra as well as the known absolute magnitudes, these are all very luminous stars. However, without exception, their metallic line spectra are in striking contrast to those of galactic stars of similar types: the SMC supergiants have metal lines no stronger than those of galactic dwarfs and giants. There is some evidence for a range of metal line strengths among the SMC stars. A comparison with quantitative measures from the high-dispersion literature for galactic stars indicates Si IV line strength deficiencies of factors from 2 to 4 for the SMC supergiants.
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