Instabilities of captured shocks in the envelopes of massive stars

Details Instabilities of captured shocks in the envelopes of massive stars Instabilities of captured shocks in the envelopes of massive stars

2003-09-25

arxiv.org/abs/astro-ph/0309708v1

Mon.Not.Roy.Astron.Soc.347:481,2004

Astronomy and Astrophysics

Astrophysics

16 pages, 6 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07222.x

The evolution of strange mode instabilities into the non linear regime has been followed by numerical simulation for an envelope model of a massive star having solar chemical composition, M=50M_sun, T_eff=10^4K and L=1.17*10^6 L_sun. Contrary to previously studied models, for these parameters shocks are captured in the H-ionisation zone and perform rapid oscillations within the latter. A linear stability analysis is performed to verify that this behaviour is physical. The origin of an instability discovered in this way is identified by construction of an analytical model. As a result, the stratification turns out to be essential for instability. The difference to common stratification instabilities, e.g., convective instabilities, is discussed.

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