Empirical relations for the sensitivities of solar-like oscillations to magnetic perturbations

Empirical relations for the sensitivities of solar-like oscillations to magnetic perturbations
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类太阳振荡对磁扰动敏感性的经验关系

DOI:
10.1093/mnras/staa1807
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发表时间:
2020
影响因子:
4.8
通讯作者:
Broomhall A
Broomhall A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Broomhall A

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对于给定的恒星模型,恒星的振荡模式频率通常被视为静态的。然而,在现实中,它们可能会受到时变来源的干扰,例如磁场和流动。我们计算了一组质量在0.7~3.0M⊙之间的模型从主序列到早期渐近巨型分支的径向p模振荡的灵敏度。对于恒星演化的六个阶段,我们用基本恒星参数中的多项式来拟合这些模式灵敏度。我们发现,最佳拟合关系不同于文献中提出的关系,也不同于恒星演化阶段之间的变化。结合微扰强度的测量,例如磁活动水平的测量,所提出的关系可用于评估恒星的观测到的振荡频率是否可能接近未受扰动的基态,或者它们是否应该被调整。
Oscillation mode frequencies of stars are typically treated as static for a given stellar model. However, in reality they can be perturbed by time-varying sources such as magnetic fields and flows. We calculate the sensitivities of radial p-mode oscillations of a set of models for masses between 0.7 and 3.0 M⊙from the main sequence to the early asymptotic giant branch. We fit these mode sensitivities with polynomials in fundamental stellar parameters for six stages of stellar evolution. We find that the best-fitting relations differ from those proposed in the literature and change between stages of stellar evolution. Together with a measure of the strength of the perturbation, e.g. of the level of magnetic activity, the presented relations can be used for assessing whether a star’s observed oscillation frequencies are likely to be close to the unperturbed ground state or whether they should be adjusted.
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