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| Paper: |
Vibrational Instability of Metal Poor Stars due to Ɛ-Mechanism |
| Volume: |
462, Progress in Solar/Stellar Physics with Helio- and Asteroseismology |
| Page: |
32 |
| Authors: |
Sonoi, T.; Shibahashi, H. |
| Abstract: |
A non-adiabatic analysis of Population III star instabilities was carried out, taking into account the perturbation
of nuclear energy generation. We found a vibrational instability caused by the varepsilon-mechanism,
due to the 3He-3He reaction of the pp-chain for Population III stars with mass M ≤ 13 M☉.
We also investigated the metallicity dependence of the stability, and found that stars with Z ≤ 10–4 located on the left side of the classical instability strip are vibrationally unstable. Besides that, we found that, after the onset of the CNO-cycle,
in the Population III stars, g-modes of a wide range of degree ℓ become unstable due to Kato's mechanism. |
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