Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264...50k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 1/SEP1, P. 50, 1993
Other
107
Instabilities - Radiative Transfer - Stars: Oscillations - Supergiants - Stars: Variables: Other
Scientific paper
Following a similar investigation based on the LAOL opacities, the stability of massive stars is re-examined using the latest available OPAL opacity tables. Two groups of dynamical strange-mode and mode-coupling instabilities are identified, one associated with He ionization and the other with the enhancement of opacity due to heavy elements. In the Hertzsprung-Russell diagram, the stability boundary of the first group closely resembles the observed Humphreys-Davidson limit, while the second group provides a strongly metallicity-dependent instability domain that covers the range of observed luminous blue variables for solar chemical composition. Relations to instabilities on the upper main sequence and in the β Cepheid regime are discussed, and the significance of these strong instabilities for stellar and galactic evolution is stressed.
Fricke Klaus J.
Glatzel Wolfgang
Kiriakidis M.
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