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arXiv 1202.4388astro-ph.SR
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天琴座RZ天琴座Blazhko RR的广泛测光研究

An extensive photometric study of the Blazhko RR Lyrae star RZ Lyr

J. Jurcsik, Á. Sódor, G. Hajdu, B. Szeidl, Á. Dózsa, K. Posztobányi, P. Smitola, B. Belucz, V. Fehér, Zs. Kővári, L. Kriskovics, E. Kun, L. Molnár, I. Nagy, K. Vida, N. Görög

摘要:

最近,扩展多色CCD和档案光电,摄影和视觉观测的分析揭示了几个重要的属性RZ Lyr,一个RRab型变量表现出大振幅Blazhko调制。在\sim 110年的时基上,建立了脉动与调制周期变化之间的严格的线性关系。天琴座RZ的光变曲线在小振幅调制阶段的下降分支上显示出显著的隆起,类似于隆起的造父变星的光变曲线。我们推测,恒星的结构暂时适合在这个调制阶段的基本和高阶径向模式之一的周期之间的4:1共振。RZ Lyr的光变曲线变化可以正确地与两个调制分量的解决方案相拟合;主调制的121 d周期几乎是但不完全是次级调制分量周期的四倍。使用逆光度法,在两个调制分量的不同相位的物理参数的脉动平均值的变化被确定。

英文摘要:

The analysis of recent, extended multicolour CCD and archive photoelectric, photographic and visual observations has revealed several important properties of RZ Lyr, an RRab-type variable exhibiting large-amplitude Blazhko modulation. On the time-base of \sim110 yr, a strict anticorrelation between the pulsation and modulation period changes is established. The light curve of RZ Lyr shows a remarkable bump on the descending branch in the small-amplitude phase of the modulation, similarly to the light curves of bump Cepheids. We speculate that the stellar structure temporally suits a 4:1 resonance between the periods of the fundamental and one of the higher-order radial modes in this modulation phase. The light-curve variation of RZ Lyr can be correctly fitted with a two-modulation-component solution; the 121 d period of the main modulation is nearly but not exactly four times longer than the period of the secondary modulation component. Using the inverse photometric method, the variations in the pulsation-averaged values of the physical parameters in different phases of both modulation components are determined.

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