论文标题
搜索八个短期II型cepheids的周期更改
A search for period changes of eight short-period Type II Cepheids
论文作者
论文摘要
在这项研究中，我们研究了BL的八个短周期II型头型的周期变化，即她的亚型，即1-4天范围内的周期。这些恒星的$ O-C $图是使用地面和太空调查的所有合适的观察数据来构建的。这跨越了一个多世纪的时间间隔，其中包括数字化的摄影板以及文献的光度法。 $ o-c $图显示了抛物线进化趋势，这表明这八个短期恒星的存在和减少的周期存在。这些时期的变化与她的恒星的最新理论进化框架和出色的进化模型非常吻合。 Lombard和Koen提出的脉动稳定性测试还表明，该时期的变化是真实的。
In this study, we investigate the period changes of eight short-period Type II Cepheids of the BL Her subtype, i.e., with periods in the 1-4 day range. The $O-C$ diagrams for these stars are constructed using all suitable observational data from ground and space surveys. This spans a time interval of over one century and includes digitized photographic plates as well as photometry from the literature. The $O-C$ diagrams show parabolic evolutionary trends, which indicate the presence of both increasing and decreasing periods for these eight short period stars. These period changes are in good agreement with the recent theoretical evolutionary framework and stellar evolution models for BL Her stars. The pulsation stability test proposed by Lombard and Koen also suggests that the changes in the periods are real.
