Evolving Morphology of Resolved Stellar Einstein Rings

Abstract We consider strong gravitational lensing by nearby stars. Using our wave-optical treatment of phenomena, we study Einstein rings that may form around stellar lenses. It is remarkable these are bright and large enough to be detected resolved existing instruments. Such events have durations hours or days, with peak light amplification lasting for several minutes. Many such predicted using the Gaia astrometric catalog. Serendipitous discoveries also possible. Fortuitous alignments can used confirm discover exoplanets. For lenses dense regions in their background, occur time a year, warranting continuous recurrent monitoring. Resolved imaging spectroscopy evolving morphology an ring offers knowledge about both lens source. The angular size amounts direct measurement mass. changing orientation major minor images source information related mutual objects. event duration, when full present, helps determine source’s size. sky position planetary constrains planet’s orbit. Spectroscopy allows investigations frequency predictability wealth obtained motivate observational campaigns facilities and/or construction new instruments dedicated search forming As specific example, 2028 red giant ? Centauri A discuss relevant science campaign.