Preliminary measurement of Eta UMa and future catalog with stellar intensity interferometry

Eta UMa is a bright, rotating star in the Ursa Majoris constellation. Its rapid rotation causes broadened absorption lines which are distorted due to a decretion disk, as well as an oblately shaped photosphere. We collect data using the VERITAS Gamma Ray Observatory which is used for stellar intensity interferometry (SII) at a wavelength of 417 nm during the full moon. Using data collected with VERITAS-SII from 2020-2024 totaling to approximately 40 hours, a preliminary measurement of its average angular size can be made. Data collected before 2023 is in a different format than current data, and combining the two data sets is non-trivial. Using the tools developed with the Eta UMa analysis, a catalog of preliminary measurements of several stars in both our new and old data base will be made. In this talk, I will discuss the process of analyzing VERITAS-SII data, the measurement of Eta Uma, its scientific importance, and future applications.