Radial pulsation of less-massive yellow supergiants. I - 1 solar mass 3200 solar luminosity models

Details Radial pulsation of less-massive yellow supergiants. I - 1 solar mass 3200 solar luminosity models Radial pulsation of less-massive yellow supergiants. I - 1 solar mass 3200 solar luminosity models

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.112..125a&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 112, no. 1, May 1985, p. 125-131.

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Stellar Luminosity, Stellar Mass, Stellar Models, Stellar Oscillations, Supergiant Stars, Computational Astrophysics, Hydrodynamics, Light Curve, Nonlinear Systems, Stellar Temperature, Velocity Distribution

Scientific paper

Linear pulsation models of less-massive yellow supergiants with M = 1 solar mass and L = 3200 solar luminosity were investigated with the aim of understanding FG Sge's pulsation. It is found that the instability of the third overtone extends to at least Te = 8500 K, while the blue edge of the fundamental mode is near Te = 5500 K. Nonlinear hydrodynamic simulations were performed for models with Te = 6000 K and 5400 K with the same mass and luminosity as the linear models. Small limiting-amplitude pulsation due to the linearly unstable third overtone mode in the former model is found. In the latter model, a limiting amplitude of pulsation with the period of the fundamental mode is found. However, the latter pulsaton shows sub-structure which is caused by coupling between the fundamental and the third overtone modes and also possibly the second overtone mode. It is suggested that the pulsaton of FG Sge must have undergone mode-switching from the third overtone to the fundamental mode during its evolution toward later spectral types.

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