盾牌座δ星频率间隔的规律和s-f图
Regularities in the frequency spacings of Delta Scuti stars and the s-f Diagram
摘要：
对几颗盾牌座δ恒星（FG Vir，44 Tau，BL Cam等）的统计分析表明，光度测量观测到的频率在许多径向阶上聚集在径向模式的频率周围。观测到的辐射可以部分解释为被困在恒星包层中的模式。这种模式选择机制已经由Dziembowski和Krolikowska（1990）提出，并且被证明对于l=1模式是有效的。新的脉动模型计算证实了所观察到的脉动。我们给出了s-f图，它比较了径向频率的平均间隔（s）与最低不稳定径向模式的频率（f）。如果我们假设观测到的频率簇的中心对应于径向模式频率，则该图提供了对观测到的恒星的log g值的估计。这一假设得到了充分研究的盾牌座δ变星的例子的证实，在这些变星中，径向模式被明确地识别出来。
英文摘要：
Statistical analyses of several Delta Scuti stars (FG Vir, 44 Tau, BL Cam and others) show that the photometrically observed frequencies cluster around the frequencies of the radial modes over many radial orders. The observed regularities can be partly explained by modes trapped in the stellar envelope. This mode selection mechanism was already proposed by Dziembowski & Krolikowska (1990) and was shown to be efficient for l=1 modes. New pulsation model calculations confirm the observed regularities. We present the s-f diagram, which compares the average separation of the radial frequencies (s) with the frequency of the lowest unstable radial mode (f). The diagram provides an estimate for the log g value of the observed star, if we assume that the centers of the observed frequency clusters correspond to the radial mode frequencies. This assumption is confirmed by examples of well-studied Delta Scuti variables in which radial modes were definitely identified.
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