对roAp星α Cir的干涉测量和地震约束
Interferometric and seismic constraints on the roAp star alpha Cir
摘要：
我们提出了新的限制，快速振荡的Ap星阿尔法CIR，来自悉尼大学恒星干涉仪（SUSI）和有线卫星获得的干涉和测光数据的组合。本研究的主要内容有：1.第一次测定roAp星的角直径。2.一个几乎独立的模型确定的有效温度的α Cir，这被发现是低于以前估计的值。3.检测两个新的振荡频率，允许确定α Cir的大分离。基于这一新的信息，我们计算了α Cir的非磁性和磁性模型。我们发现，从新的数据中发现的观察到的大分离的值与理论模型得出的一致。此外，我们还展示了如何的磁场可以解释一些在振荡频谱中看到的异常，以及这些反过来如何提供限制的幅度和拓扑结构的磁场。
英文摘要：
We present new constraints on the rapidly oscillating Ap star alpha Cir, derived from a combination of interferometric and photometric data obtained with the Sydney University Stellar Interferometer (SUSI) and the WIRE satellite. The highlights of our study are: 1. The first determination of the angular diameter of an roAp star. 2. A nearly model-independent determination of the effective temperature of alpha Cir, which is found to be lower than previously estimated values. 3. Detection of two new oscillation frequencies allowing a determination of the large separation of alpha Cir. Based on this new information, we have computed non-magnetic and magnetic models for alpha Cir. We show that the value of the observed large separation found from the new data agrees well with that derived from theoretical models. Moreover, we also show how the magnetic field may explain some of the anomalies seen in the oscillation spectrum and how these in turn provide constraints on the magnitude and topology of the magnetic field.
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