A mechanism for the irregular variability of supergiant stars

Details A mechanism for the irregular variability of supergiant stars A mechanism for the irregular variability of supergiant stars

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...190..137b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 190, no. 1-2, Jan. 1988, p. 137-147.

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14

Irregular Variable Stars, Stellar Models, Stellar Oscillations, Supergiant Stars, Chaos, Computational Astrophysics, Stellar Luminosity, Vibration Mode

Scientific paper

The authors conjecture that some of the irregular variability observed in the supergiant variable stars has its origin in the existence of an underlying chaotic attractor. The dominant physical characteristic, which brings about this situation, is the proximity of a dynamical instability, i.e. the near vanishing of the frequency of the fundamental mode of oscillation. The authors discuss in some detail the dynamics of the interaction of this fundamental mode with a vibrational overtone and show that it is capable of exhibiting a variety of interesting variability, including intermittent oscillations and chaotic oscillations with erratic period shifts.

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