The unique frequency spectrum of the Blazhko RRc Star LS Her
The unique frequency spectrum of the Blazhko RRc Star LS Her
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Blazhko RRc Star LS Her 独特的频谱
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
E. Broens
中科院分区：
文献类型：
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作者：
P. Wils;S. Kleidis;E. Broens
天琴座RR恒星中的布拉日科效应在理论上仍然知之甚少。具有多个布拉日科周期或布拉日科效应本身变化的恒星尤其具有挑战性。这项研究调查了 RRc 恒星 LS Her 中的 Blazhko 效应。在六个月内的 63 个夜晚，我们对 V、R c 和 I c 波段的 CCD 光度进行了详细的测量。 LS Her 被证实的 Blazhko 周期为 12.75 ± 0.02 d。然而，在通常预期 Blazhko 三重态的边频率的情况下，在主脉动频率的两侧发现了三个频率的等距组。因此，Blazhko 效应本身的周期和幅度以 109 ± 4 d 为一个周期变化。 LS Her 是一个独特的物体，在验证 Blazhko 效应理论中非常重要。
The Blazhko effect in RR Lyrae stars is still poorly understood theoretically. Stars with multiple Blazhko periods or in which the Blazhko effect itself varies are particularly challenging. This study investigates the Blazhko effect in the RRc star LS Her. Detailed CCD photometry in the V, R c and I c band has been performed on 63 nights during six months. LS Her is confirmed to have a Blazhko period of 12.75 ± 0.02 d. However, where normally the side frequencies of the Blazhko triplet are expected, an equidistant group of three frequencies is found on both sides of the main pulsation frequency. As a consequence, the period and amplitude of the Blazhko effect itself vary in a cycle of 109 ± 4 d. LS Her is a unique object turning out to be very important in the verification of the theories for the Blazhko effect.