  Using the second data release from the Zwicky Transient Facility (ZTF, Bellm
et al. 2019), Chen et al. (2020) created a ZTF Catalog of Periodic Variable
Stars (ZTF CPVS) of 781, 602 periodic variables stars (PVSs) with 11 class
labels. Here, we provide a new classification model of PVSs in the ZTF CPVS
using a convolutional variational autoencoder and hierarchical random forest.
We cross-match the sky-coordinate of PVSs in the ZTF CPVS with those presented
in the SIMBAD catalog. We identify non-stellar objects that are not previously
classified, including extragalactic objects such as Quasi-Stellar Objects,
Active Galactic Nuclei, supernovae and planetary nebulae. We then create a new
labelled training set with 13 classes in two levels. We obtain a reasonable
level of completeness (> 90 %) for certain classes of PVSs, although we have
poorer completeness in other classes (~ 40 % in some cases). Our new labels for
the ZTF CPVS are available via Zenodo Cheung et al. (2021).
