Spectral and spatial imaging of the Be+sdO binary<i>ϕ</i>Persei
Spectral and spatial imaging of the Be+sdO binary<i>ϕ</i>Persei
Aims. The rapidly rotating Be star ϕ Persei was spun up by mass and angular momentum transfer from a now stripped-down, hot subdwarf companion. Here we present the first high angular resolution images of ϕ Persei made possible by new capabilities in long-baseline interferometry at near-IR and visible wavelengths. We …