The number of known periodic variables has grown rapidly in recent years. Thanks to its large field of view and faint limiting magnitude, the Zwicky Transient Facility (ZTF) offers a unique opportunity to detect variable stars in the northern sky. Here, we exploit ZTF Data Release 2 (DR2) to search for and classify variables down to r ∼ 20.6 mag. We classify 781,602 periodic variables into 11 main types using an improved classification method. Comparison with previously published catalogs shows that 621,702 objects (79.5%) are newly discovered or newly classified, including ∼700 Cepheids, ∼5000 RR Lyrae stars, ∼15,000 δ Scuti variables, ∼350,000 eclipsing binaries, ∼100,000 long-period variables, and about 150,000 rotational variables. The typical misclassification rate and period accuracy are on the order of 2% and 99%, respectively. 74% of our variables are located at Galactic latitudes, ##IMG## [http://ej.iop.org/images...] {$| b| \lt 10^\circ $}

中文翻译：

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周期性变星的Zwicky暂态设施目录

近年来，已知周期变量的数量迅速增长。Zwicky瞬变设施（ZTF）拥有广阔的视野和微弱的极限强度，为探测北部天空中的变星提供了独特的机会。在这里，我们利用ZTF数据发布2（DR2）来搜索和分类直至r〜20.6 mag的变量。我们使用改进的分类方法将781,602个周期变量分类为11种主要类型。与先前发布的目录比较显示，新发现或重新分类了621,702个对象（占79.5％），包括约700个造父变星，约5000个RR天琴星，约15,000个δScuti变量，约350,000个日蚀双星，约100,000个长周期变量，以及约150,000个旋转变量。典型的误分类率和周期准确性分别约为2％和99％。我们有74％的变量位于银河系纬度，## IMG ## [http：//ej.iop.org/images ...] {$ | b | \ lt 10 ^ \ circ $}