论文标题
Miras会显示长期的中期吗？
Do Miras show the long secondary periods?
论文作者
论文摘要
在脉动红色巨人中通常观察到的长次时期（LSP）现象尚未在任何MIRA中检测到。本文的目的是验证是否存在物理原因，或者仅仅是观察性偏见。大型麦哲伦云中长期变量的OGLE-III样品（包含1663 MIRAS）用于在这些物体中搜索次要周期性，并根据周期光度图上的位置确定长期恒星的候选者。在1663个MIRA中，有108个被确定为潜在候选者，可变性与LSP广泛一致。这使大麦芽云中的整个MIRA样品中有7％。大多数（如果不是全部的Mira LSP候选人）都是C富含C的恒星。该分析的结果表明MIRAS可能表现出长期的继发期。但是，长期变异性也可能与已知MIRAS所表现出的周期和振幅不规则有关。得出明确的结论，需要进一步的研究。
The long secondary period (LSP) phenomenon, which is commonly observed in pulsating red giants, has not been detected in any Mira yet. The goal of this paper is to verify, if there is a physical reason for this or if it is simply an observational bias. The OGLE-III Sample of Long Period Variables in the Large Magellanic Cloud, containing 1663 Miras, is used to perform a search for secondary periodicity in these objects and identify candidates for the long secondary period stars based on the location on the period-luminosity diagram. Out of 1663 Miras, 108 were identified as potential candidates, with variability broadly consistent with LSP. This makes 7% of the whole Mira sample in the Large Magellanic Cloud. Most, if not all of the Mira LSP candidates are C-rich stars. The results of this analysis suggest that Miras may exhibit long secondary periods. However, the long-term variability can also be related to period and amplitude irregularities that Miras are known to exhibit. Further study will be necessary to draw a definitive conclusion.
