OGLE数据库中P<1 d脉动星的傅立叶分解和频率分析。I.单周期盾牌座δ变星、RRc变星和RRab变星离职标准和特殊性
Fourier decomposition and frequency analysis of the pulsating stars with P<1 d in the OGLE database. I. Monoperiodic Delta Scuti, RRc and RRab variables. Separation criteria and particularities
摘要：
OGLE数据库被重新访问，调查更详细的傅立叶参数的属性。方法的改进使我们能够确定一个明确的分离之间的高振幅三角洲盾（HADS），RRc和RRab星。在HADS星中，R21参数的双峰分布被解释为RRc星的污染效应：有证据表明，所有0.20<P<0.25 d的恒星都是RRc变星。先前声称的一个子类的不寻常的HADS的存在被证明是一个虚假的结果。候选泛音消除器在HADS和RRc变量中找到。的傅立叶参数的属性进行了讨论，作为一个功能的物理条件中涉及的恒星。在场RRab星中，我们检测到不同的光变曲线组，在P>0.55 d的傅立叶图中产生明显的“尾巴”;演化阶段或不同物理条件（不仅是金属丰度）的组合被认为可以解释这种分离，在星团RRab星中也观察到了这种分离。同一个球状星团中的RRc星的恒星参数与不同星团中的RRc星的恒星参数具有不同的变化趋势。
英文摘要：
The OGLE database is revisited to investigate in more detail the properties of the Fourier parameters. Methodological improvements led us to identify a clear separation among High-Amplitude Delta Scuti (HADS), RRc and RRab stars. The bimodal distribution of the R21 parameter in HADS stars is explained as a contamination effect from RRc stars: there is evidence that all stars with 0.20<P<0.25 d are RRc variables. The previously claimed existence of a subclass of unusual HADS is demonstrated to be a spurious result. Candidate overtone pulsators are found among HADS and RRc variables. The properties of the Fourier parameters are discussed as a function of the physical conditions in the stars involved. Among the field RRab stars we detected different light-curve groups producing distinct "tails" in the Fourier plots for P>0.55 d; evolutionary phases or the combination of different physical conditions (not only metallicity) are suggested to explain this separation, observed also in the cluster RRab stars. The stellar parameters of RRc stars in a given globular cluster show different tendencies than those of RRc stars from different clusters.
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