Abstract

In a stars, planets, and ISM seminar that checks all the boxes I report results of astrometry carried out with the Hubble Space Telescope Fine Guidance Sensors. We confirm the existence of a white dwarf component of the quadruple Hyad binary, vA 351, and establish its mass. Two of the three M dwarf components orbit with an 18 hour period, and are immersed in a hydrogen cloud that evidences mass exchange (stars and ISM). In the second half of the seminar I present recent efforts to establish component masses and the architecture of the mu Arae planetary system (exoplanets). Both projects remain incomplete due to ongoing mysteries unique to each.