探索O型超巨星HD 152249中的脉动不稳定性
Exploring pulsational instabilities in the O-type supergiant HD 152249
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中文总结 AI 辅助
本文对O型超巨星HD 152249模型进行非绝热线性稳定性分析，发现奇异模不稳定性，非线性模拟显示其可导致包层膨胀和增强质量损失。
中文摘要 AI 辅助
O型超巨星的变异性是一种众所周知的现象，尽管其起源尚未被完全理解。在质量非常大、光度高的恒星中，奇异模脉动被认为可能在变异性中发挥作用。在此，我们针对与恒星HD 152249的观测参数相对应的O型超巨星模型，开展了一项初步的理论研究，该恒星显示出谱线轮廓变异性。对所考虑的该恒星模型进行了关于径向扰动的非绝热线性稳定性分析。发现了增长率达到动力学时标量级的不稳定性，其特征暗示了奇异模的存在。对选定模型的非线性模拟表明，这些不稳定性可能导致显著的外包层膨胀、有限振幅脉动，并可能有助于增强质量损失。
英文摘要
Variability in O-type supergiants is a well known phenomena although their origin is not fully understood. In very massive, luminous stars, strange mode pulsations have been suggested to play a role in the variability. Here, we present a preliminary theoretical study of O-type supergiant models corresponding to the observed parameters of the star HD 152249, which shows line profile variability. Non-adiabatic linear stability analysis with respect to radial perturbations is carried out for the considered models of this star. Instabilities with growth rates of the order of dynamical timescale are found, with characteristics suggestive of strange modes. Non-linear simulations for selected models indicate that the instabilities could lead to significant envelope inflation, finite amplitude pulsation and may contribute to enhanced mass loss.
发表机构
- National Institute of Technology, Rourkela（鲁尔基拉国家理工学院）
- Aryabhatta Research Institute of Observational Sciences（阿亚玻陀观测科学研究院）
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