Title: J-VAR: Analysis of RR Lyrae light curves in seven optical bands Show Chinese title

Title: J-VAR：七种光学波段中RR Lyrae光变曲线的分析

Abstract: Context. RR Lyrae stars are key distance indicators and tracers of old stellar populations in the Milky Way and its satellites. Accurate period and amplitude measurements are essential for constraining stellar evolution and mapping Galactic structure. The Javalambre VARiability (J-VAR) survey provides valuable time-series data across seven optical bands, including gri and four medium and narrow bands. Aims. Our goal is to construct and analyze light curves for RR Lyrae stars identified in the first data release (DR1) of the J-VAR survey using the Gaia DR3 variable stars catalog as a reference. Methods. The light curves of 315 RR Lyrae were analyzed by fitting templates from the Sloan Digital Sky Survey (SDSS) multiband template library. The periods and amplitudes for the seven bands in J-VAR were independently obtained from the best-fitted templates. Results. The J-VAR periods show strong agreement with Gaia DR3 values, which confirms the reliability of the applied methodology. The Bailey diagram for each J-VAR filter reveals the expected trend for RRab and RRc stars, with larger pulsation amplitudes at bluer wavelengths. After normalizing by the r-band amplitude, an exponential trend is found, with the bluer J-VAR filter centered at 395 nm having twice the amplitude of the reddest J-VAR passband at 861 nm. The normalized amplitudes of the RR Lyrae stars from Gaia and the Zwicky Transient Facility (ZTF) are consistent with the J-VAR trend. Finally, the SDSS templates derived from broadbands also provide a proper description for the medium and narrow band light curves. Conclusions. The J-VAR RR Lyrae catalog offers reliable pulsation parameters and light curves in seven optical filters, allowing the systematic study of amplitude trends from 395 to 860 nm and offering a unique benchmark for theoretical models. Show Chinese abstract

Abstract: 上下文。 RR Lyr星是银河系及其卫星中古老恒星种群的关键距离指示器和示踪剂。 准确的周期和振幅测量对于限制恒星演化和绘制银河结构至关重要。 Javalambre VARiability（J-VAR）调查提供了跨越七个光学波段的时间序列数据，包括gri和四个中等和窄带。 目标。 我们的目标是使用Gaia DR3变星目录作为参考，构建并分析在J-VAR调查第一次数据发布（DR1）中识别出的RR Lyr星的光曲线。 方法。 通过拟合斯隆数字天空调查（SDSS）多波段模板库中的模板，分析了315个RR Lyr的光曲线。 J-VAR中七个波段的周期和振幅是从最佳拟合模板中独立获得的。 结果。 J-VAR的周期与Gaia DR3值高度一致，这证实了所采用方法的可靠性。 每个J-VAR滤镜的Bailey图显示了RRab和RRc星的预期趋势，在更蓝的波长下有更大的脉动振幅。 在以r波段振幅归一化后，发现了一个指数趋势，更蓝的J-VAR滤镜中心位于395 nm，其振幅是红最深的J-VAR波段861 nm的两倍。 来自Gaia和Zwicky Transient Facility（ZTF）的RR Lyr星的归一化振幅与J-VAR趋势一致。 最后，从宽带导出的SDSS模板也对中等和窄带光曲线提供了适当的描述。 结论。 J-VAR RR Lyr目录在七个光学滤镜中提供了可靠的脉动参数和光曲线，允许系统研究从395到860 nm的振幅趋势，并为理论模型提供了一个独特的基准。