论文标题
RR Lyrae Fourier光曲线分解的辩护，用于计算球形簇中的金属性和距离
A vindication of the RR Lyrae Fourier light curve decomposition for the calculation of metallicity and distance in globular clusters
论文作者
论文摘要
我们在37个球状簇样品中报告了RR Lyre恒星的平均金属性和绝对幅度，该样品通过其光曲线的傅立叶分解和以前所未有的同质方法计算得出。这使水平分支（HB）光度的金属性依赖性作为基本距离指标的新讨论。 RRAB和RRC星的校准应分别处理。对于RRAB，色散更大且非线性。对于RRC恒星，相关性不那么陡峭，非常紧密且线性。强调HB结构参数L的相关性，并提供MV形式（[Fe/H]，L）的非线性校准。从光曲线分解的值和MV的值之间发现了极好的一致性，并具有光谱值和通过GAIA-DR3和HST获得的距离。 35个集群中的可变星人口普查包括我们程序发现的326颗恒星。
We report the mean metallicity and absolute magnitude of RR Lyrae stars in a sample of 37 globular clusters, calculated via the Fourier decomposition of their light curves and ad hoc semiempirical calibrations, in an unprecedented homogeneous approach. This enabled a new discussion of the metallicity dependence of the horizontal branch (HB) luminosity, as a fundamental distance indicator. The calibration for the RRab and RRc stars should be treated separately. For the RRab the dispersion is larger and non-linear. For the RRc stars the correlation is less steep, very tight and linear. The relevance of the HB structural parameter L, is highlighted and offer a non-linear calibration of the form MV ([Fe/H],L). Excellent agreement is found between values of [Fe/H] and MV from the light curve decomposition with spectroscopic values and distances obtained via Gaia-DR3 and HST. The variable stars census in 35 clusters includes 326 stars found by our program.
