An Analysis of Archival Data with Preliminary Measurements from VERITAS-SII

Stellar Intensity Interferometry (SII) is an astronomical technique that uses the correlation of light intensity fluctuations from two different telescopes to determine the star's angular size. Though this technique has been around since the 1950s, the practice was abandoned due to limitations in technology. In the past few years, new developments in technology and instrumentation have allowed for the revitalization of the method at Imaging Air Cherenkov Telescopes, such as VERITAS (Very Energetic Radiation Imaging Telescope Array System). VERITAS-SII has collected almost 1000 hours of data over its six years of operation, and this poster presents a comprehensive study of archival data, which will help us characterize systematic effects. This study compares two methods of which we process raw data, a FPGA-based and a software-based correlation method. This study compares preliminary angular diameter measurements with previously published values.