The Role of Disk Tearing and Precession in the Observed Variability of Pleione

We acquired H α spectroscopic observations from 2005 to 2019 showing Pleione has transitioned from a Be phase to a Be-shell phase during this period. Using the radiative transfer code hdust , we created a grid of ∼100,000 disk models for Pleione. We successfully reproduced the observed transition wi...

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