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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Stability analysis of strange-modes in hot massive stars with time-dependent convection
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Stability analysis of strange-modes in hot massive stars with time-dependent convection

机译：具有时间依赖性对流的热大质量恒星奇特模式的稳定性分析

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We carry out a nonadiabatic analysis of strange-modes in hot massive stars with timedependent convection (TDC). In the envelopes of such stars, convective luminosity is not so dominant as it is in the envelopes of stars on the redder side of the classical instability strip. Around the Fe opacity bump, however, convection contributes nonnegligibly to energy transfer. Indeed, we find that the instability of modes excited at the Fe bump is likely to be weaker with TDC as compared with the case of adopting the frozen-in convection (FC) approximation. But we confirm that unstable strange-modes certainly remain in hot massive stars even by taking into account TDC. We also examine properties of the strange-mode instability, which is related to destabilization of strangemodes without adiabatic counterparts. In this type of instability, a phase lag between density and pressure varies from 0? to 180? in an excitation zone, unlike the case of the κ-mechanism. In addition, we confirm by comparing two models with Z = 0 and Z = 0.02 that the dominance of radiation pressure is important for this type of instability.
机译：我们对具有时间依赖性对流（TDC）的炽热大质量恒星进行了非绝热分析。在这类恒星的包层中，对流光度并不像在经典不稳定性带的较红边上的恒星的包层中那样占主导地位。然而，在Fe的不透明凸点周围，对流对能量转移的贡献不可忽略。确实，我们发现与采用冻结对流（FC）近似的情况相比，TDC在Fe凸点处激发的模态的不稳定性可能更弱。但是我们确认，即使考虑到TDC，不稳定的奇怪模式也肯定会留在炽热的大质量恒星中。我们还检查了奇怪模式不稳定性的性质，这与没有绝热对应物的奇怪模式的不稳定有关。在这种类型的不稳定性中，密度和压力之间的相位滞后从0？变化。到180？与κ机制不同，它在激发区中。此外，我们通过比较Z = 0和Z = 0.02的两个模型，确认辐射压力的主导性对于这种类型的不稳定性很重要。

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