The H-R diagram of the Large Magellanic Cloud and implications for stellar evolution

Details The H-R diagram of the Large Magellanic Cloud and implications for stellar evolution The H-R diagram of the Large Magellanic Cloud and implications for stellar evolution

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363..119f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 1, 1990, p. 119-130.

Astronomy and Astrophysics

Astrophysics

121

G Stars, Hertzsprung-Russell Diagram, Magellanic Clouds, O Stars, Stellar Evolution, Supergiant Stars, Interstellar Extinction, Star Distribution, Stellar Luminosity, Stellar Models, Stellar Spectra

Scientific paper

An H-R diagram for the Large Magellanic Cloud is produced using a sample of 1375 'normal' spectral class O through G supergiants. The definition of 'normal' includes all O stars that fit into the standard two-dimensional spectral classification framework and all later type stars that do not exhibit optical emission lines. The upper luminosity limit observed for this sample agrees with previous estimates and indicates that only stars initially less massive than about 40 solar masses evolve to the red supergiant region. Between luminosities of M(bol) = -8.l5 and M(bol) = -6.0, a discontinuity is found in the density distribution of stars in the region of the blue supergiants. On the hotter side of a line, the density of stars is over five times greater than on the cooler side. This feature is identified with an evolutionary time scale change occurring during the core helium-burning phase of the evolution of intermediate mass stars. It is suggested that this feature is best reproduced by stellar evolution models which contain 'blue loops'.

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