Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1123f&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Nov. 1991, p. 1123-1148.
Astronomy and Astrophysics
Astronomy
54
B Stars, Magellanic Clouds, Sky Surveys (Astronomy), Stellar Spectra, Supergiant Stars, Blue Stars, Metallic Stars, Spectrum Analysis, Stellar Cores, Stellar Evolution
Scientific paper
The results of a low-dispersion digital optical spectral survey of about 100 B-type supergiants in the Large Magellanic Cloud are presented. The MK spectral classification framework for B supergiants has been transferred to the metal-weak LMC stars, and recommended classification standards have been designated. Variations among the metal line strengths are examined. The most extreme variations are found for the nitrogen lines, for which a range of a factor of 3 or more may be seen in the equivalent widths within some spectral subclasses. It is suggested that these variations indicate a range of nitrogen surface abundances among the B supergiants, resulting from contamination of some of the stellar surfaces by processed material from the original H-burning core.
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