Stellar Rotation with Roman as a Map to Galactic Archaeology

Rotation is a fundamental property of stars that is useful in characterizing the ages of the stellar populations that make up our Galaxy. The Nancy Grace Roman Space Telescope will perform time domain surveys that stand to at least double the number of period measurements, and consequently rotational ages, and for populations that have yet to be studied in rotation. I will review the ways that rotation and other time-domain stellar features have been used to map our Galaxy’s history and highlight our use of deep learning to extract stellar rotation periods from Roman’s time domain surveys, including one hundred thousand periods we expect from the Galactic Bulge Time Domain Survey (GBTDS). I will discuss the new populations we expect to uncover in rotation, and I will preview the transformational new science of star spots that the GBTDS’s multi-wavelength time series will enable.