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Based on 14 Miras located in 7 globular clusters, we derived the firstgr-band period-luminosity (PL) at maximum light for the large-amplitude Miravariables using the multi-year light-curve data collected from the ZwickyTransient Facility (ZTF). Since Miras are red variables, we applied acolor-term correction to subsets of ZTF light curves, and found that suchcorrections do not have a large impact on period determinations. We applied ourderived PL relations to the known extragalactic Miras in five local galaxies(Sextans, Leo I, Leo II, NGC6822 and IC1613), and determined their Mira-baseddistances. We demonstrated that our PL relations can be applied to short-period(<300 days) Miras, including those in the two most distant galaxies (NGC6822and IC1613) in our sample even when only a portion of the light-curves aroundmaximum light have detections. We have also shown that the long-periodextragalactic Miras do not follow the PL relations extrapolated to longerperiods. Hence, our derived PL relations are only applicable to theshort-period Miras, which will be discovered in abundance in local galaxieswithin the era of Vera C. Rubin Observatory's Legacy Survey of Space and Time.

the astronomical journal

Zwicky Transient Facility and Globular Clusters: the gr-Band  Period-Luminosity Relations for Mira Variables at Maximum Light and Their  Applications to Local Galaxies