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Time-domain studies of pre-main sequence stars have long been used toinvestigate star properties during their early evolutionary phases and to tracethe evolution of circumstellar environments. Historically these studies havebeen confined to the nearest, low-density, star forming regions. We used theWide Field Camera 3 on board of the Hubble Space Telescope to extend, for thefirst time, the study of pre-main sequence variability to one of the few youngmassive clusters in the Milky Way, Westerlund 2. Our analysis reveals that atleast 1/3 of the intermediate and low-mass pre-main sequence stars inWesterlund 2 are variable. Based on the characteristics of their light curves,we classified ~11% of the variable stars as weak-line T-Tauri candidates, ~ 52%as classical T-Tauri candidates, ~ 5% as dippers and ~26% as bursters. Inaddition, we found that 2% of the stars below 6Mo (~6% of the variables) areeclipsing binaries, with orbital periods shorter than 80 days. The spatialdistribution of the different populations of variable pre-main sequence starssuggests that stellar feedback and UV-radiation from massive stars play animportant role on the evolution of circumstellar and planetary disks.

Time-domain study of the young massive cluster Westerlund 2 with the Hubble Space Telescope. I