Abstract
We have started a systematic observational study of the 22 GHz water masers and 44 GHz class I methanol masers in high-mass star-forming regions as a four-year KaVA large program since 2016. The primary aim of our project is to investigate dynamical evolution of high-mass young stellar objects and their circumstellar structures by observing spatial distributions and 3-dimensional velocity fields of water and methanol maser features. In 2016, we carried out imaging survey of the 25 water masers at 22 GHz and 19 class I methanol masers at 44 GHz selected from our initial source catalog. Based on these results, we have started proper motion measurements of 16 selected water maser sources at 22 GHz in 2018. In addition, we also selected 3 class I methanol maser sources to measure the proper motions for the first time with VLBI. We will present current status of our KaVA large program and future plans.
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