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arXiv 1702.021722017-02-07astro-ph.SR

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RR Lyrics星级在NGC 6362

RR Lyrae stars in NGC 6362

R. Smolec, P. Moskalik, J. Kaluzny, W. Pych, M. Rozyczka, I. B. Thompson

备注：: Accepted for publication in MNRAS. Three animations available as ancillary files
发表信息：: MNRAS, 467(2): 2349-2366 (2017)
DOI：: 10.1093/mnras/stx088

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摘要：

本文分析了由CASE项目收集的球状星团NGC 6362中天琴座RR型星11个观测季的高质量测光资料。其中16颗是基模复频星（RRab星），16颗是第一泛音复频星（RRc星）。在两颗恒星，以前确定为RRab，V3和V34，我们检测到额外的周期性确定为径向第一泛音模式。低于通常的周期比（0.730和0.728），占主导地位的脉动在径向基本模式和存在的长周期调制表明，这两个变量不是经典的RRd星，但最近发现的异常RRd变量类的新成员。在一个显着的比例RRc星，63%，我们检测到额外的较短的周期变化在（0.60，0.65）$P_1$范围。这种形式的双周期脉动必须是常见的第一泛音RR天琴座恒星，空间观测表明。我们在NGC 6362中发现的发病率是迄今为止报道的地面观测中最高的。我们详细研究这些恒星的性质，特别是我们确认，在颜色星等图，这组是相邻的RRab和RRc星之间的接口，作为第一次报告中的分析M3的观测Jurcsik等人的发病率的Blazhko效应也非常高：我们观察到它在69%的RRab星和19%的RRc星。罕见的，双周期调制报告在一个RRab和一个RRc星。最后，我们讨论V37 --一个特殊的变量，我们在其中检测到两个接近的高振幅周期和调制。其先前的RRc分类必须被视为暂定。

英文摘要：

We present the analysis of the top-quality photometry of RR Lyrae stars in the globular cluster NGC 6362, gathered over 11 observing seasons by the CASE project. 16 stars are fundamental mode pulsators (RRab stars) and 16 are first overtone pulsators (RRc stars). In two stars, previously identified as RRab, V3 and V34, we detect additional periodicity identified as radial first overtone mode. Lower than usual period ratios (0.730 and 0.728), dominant pulsation in the radial fundamental mode and presence of a long-period modulation indicate, that these two variables are not classical RRd stars, but are new members of the recently identified class of anomalous RRd variables. In a significant fraction of RRc stars, 63 per cent, we detect additional shorter-period variability in the (0.60, 0.65)$P_1$ range. This form of double-periodic pulsation must be common in first overtone RR Lyr stars, as space observations indicate. The incidence rate we find in NGC 6362, is the highest in ground-based observations reported so far. We study the properties of these stars in detail; in particular we confirm that in the colour-magnitude diagram, this group is adjacent to the interface between RRab and RRc stars, as first reported in the analysis of M3 observations by Jurcsik et al. The incidence rate of the Blazhko effect is also very high: we observe it in 69 per cent of RRab stars and in 19 per cent of RRc stars. Rare, double-periodic modulation is reported in one RRab and in one RRc star. Finally we discuss V37 - a peculiar variable in which we detect two close high-amplitude periodicities and modulation. Its previous classification as RRc must be treated as tentative.

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