Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.344..109d&link_type=abstract
In ESA, Solar Physics and Astrophysics at Interferometric Resolution p 109-111 (SEE N93-10901 01-90)
Astronomy and Astrophysics
Astrophysics
Giant Stars, Gravity Waves, Interferometry, Shock Waves, Stability, Stellar Evolution, Hertzsprung-Russell Diagram, Stellar Atmospheres, Stellar Luminosity, Supergiant Stars
Scientific paper
The importance of interferometry of yellow hypergiants is stressed because of their presumable evolutionary performance in relation to the 'yellow evolutionary void'. The large scale motion field due to nonlinear pulsations, the evolutionary atmospheric instability, the mass loss, and the formation of a 'decretion' disk are discussed. Yellow supergiants are stars with nearly unstable atmospheres, characterized by strong low mode non radial pulsations and intense mass loss. In the Hertzprung Russel diagram, they are located at the cool side of a region where atmospheres are unstable. The atmospheric pulsations should manifest themselves as hot and cool areas in the disk. The strong mass loss will lead to a rather dense equatorial decretion disk that should be observable interferometrically. Many other types of stars may have similar properties.
de Jager Cornelis
Nieuwenhuijzen Hans
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