The curious variation of the blue-to-red supergiant ratio across the face of the Large Magellanic Cloud

Details The curious variation of the blue-to-red supergiant ratio across the face of the Large Magellanic Cloud The curious variation of the blue-to-red supergiant ratio across the face of the Large Magellanic Cloud

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..628c&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Oct.-Nov. 1979, p. 628-631. NSF-supported research.

Astronomy and Astrophysics

Astronomy

7

Magellanic Clouds, Red Giant Stars, Star Distribution, Supergiant Stars, Abundance, Gas Density, Hydrogen Atoms, Hydrogen Clouds

Scientific paper

Using recent catalogs of blue and red supergiants in the LMC we have examined the variation in the B/R ratio over the face of the Large Cloud. We find that the variation is systematic across the galaxy in regions roughly parallel to the steep H I density gradient rather than radially from the center. Further we show from systematic changes in the mean spectral type of the blue stars in these zones, as well as from the oxygen abundance of the gas in H II regions, that the B/R variation is a sensitive indicator of metal abundance changes. The fact that the B/R zones and the H I density gradient are aligned strongly suggests the existence of an environmental influence on current star formation in the LMC.

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