Speaker
Description
The VERITAS Stellar Intensity Interferometer (VSII) has been performing observations of bright (OBA) stars in the visible waveband (416 nm) since 2019. Over 1000 hours of bright- and dark-sky VSII observations have been made on 58 bright stars, fast rotators, and multi-star systems, forming the VSII Northern Hemisphere Survey. In this talk, we will present the first results from the analysis of the Northern Sky Survey, including interferometric sensitivity to deformed stellar envelopes and binary-star systems. We will present new direct measurements of stellar diameters at short optical wavelengths and compare them with interferometric measurements at longer wavelengths. We will discuss the ability of short-wavelength intensity interferometry measurements to provide tighter constraints on stellar rotation and the orbital parameters of binary-star systems.
