AI 中文总结
研究旨在扩大β型造父变星星震学正向建模样本，利用新颖方法搜索非径向模式旋转分裂，成功建模36颗星并约束关键参数，确认径向差动旋转常见，且典型旋转剖面可能非单调。
AI 中文摘要
主序星内部旋转的星震学观测表明，角动量传输比预期更有效。目前尚不清楚是哪些传输机制导致了这种情况。径向差动旋转的探测为这些传输机制提供了有价值的约束。这已在几颗大质量主序β型造父变星中被探测到，尽管到目前为止，只有不到十颗β型造父变星进行了详细的星震学建模。我们旨在扩大星震学正向建模的β型造父变星样本，以最大程度地利用它们在观测上约束角动量传输机制的潜力。为此，我们试图约束它们的旋转剖面。我们在一个具有确定模式度的大β型造父变星样本中搜索非径向模式的旋转分裂。这些样本采用了一种新颖的正向建模方法，该方法使用最先进的StORM振荡代码一致地考虑了二阶旋转效应。我们成功地对36颗β型造父变星进行了建模，并约束了关键参数，如它们的初始质量、内部旋转频率、对流核心质量和年龄。与中等质量主序星一样，β型造父变星在沿着主序演化时，其内部旋转速率总体上会降低。在17颗β型造父变星中约束了径向差动旋转。至少14颗恒星的旋转速率变化超过10%。在这14颗恒星中，有10颗的旋转速率从核心到表面递减，而其中4颗则相反。我们确认径向差动旋转在β型造父变星中很常见。此外，我们约束的旋转剖面表明，典型的β型造父变星旋转剖面可能是非单调的。
英文摘要
Asteroseismic observations of the interior rotation of main sequence stars have shown that angular momentum transport is much more efficient than expected. Which transport mechanisms are responsible for this is still unclear. Detections of radial differential rotation provide valuable constraints on these transport mechanisms. Differential rotation has been detected in several massive main sequence $β$ Cep pulsators, even though fewer than ten $β$ Cep stars have been asteroseismically modelled in detail so far. We aim to expand the sample of asteroseismically forward modelled $β$ Cep pulsators and exploit their potential to constrain angular momentum transport mechanisms. To that end, we seek to constrain their rotation profiles. We searched for rotational splitting of non-radial modes in a large $β$ Cep sample with identified mode degrees. These were subjected to a novel forward modelling approach involving a 6-dimensional parameter space, which consistently accounts for second-order rotation effects using the state-of-the-art StORM oscillation code. We successfully modelled 36 $β$ Cep stars and constrained crucial parameters such as their initial mass, internal rotation frequency, convective core mass, and age. Like in intermediate-mass stars, the internal rotation rate globally decreases in $β$ Cep stars as they evolve along the main sequence. Radial differential rotation is constrained in 17 $β$ Cep stars. We detect statistically significant deviations from quasi-rigid rotation in 13 stars. Our constraints on eight of these 13 stars indicate the rotation rate decreases with radius while it increases in three other stars, and two display non-monotonic rotation profiles. We affirm that radial differential rotation is common in $β$ Cep stars. Moreover, our constrained rotation profiles suggest that $β$ Cep rotation profiles may be non-monotonic.
Comments21 pages, 19 figures, re-submitted to Astronomy and Astrophysics
