Fossil dust shells around luminous supergiants

Details Fossil dust shells around luminous supergiants Fossil dust shells around luminous supergiants

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197l..25s&link_type=abstract

Astrophysical Journal, vol. 197, Apr. 1, 1975, pt. 2, p. L25-L27.

Astronomy and Astrophysics

Astronomy

22

Cosmic Dust, Infrared Astronomy, Stellar Evolution, Stellar Luminosity, Supergiant Stars, G Stars, Hertzsprung-Russell Diagram, K Stars, Main Sequence Stars, Stellar Envelopes, Stellar Spectra

Scientific paper

The observed frequency with which infrared excesses appear in F, G, and K supergiants of luminosity class Ia supports the idea that these excesses arise in a 'fossil' circumstellar dust shell that was formed during a prior M-super-giant phase of evolution. The required leftward evolution of the star on the H-R diagram would then imply that the Ledoux, rather than the Schwarzschild, criterion for convective mixing is the correct criterion to use in stellar evolution calculations.

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