Multiplicity of Galactic Cepheids from long-baseline interferometry V.
High-accuracy orbital parallax and mass of SU Cygni
Multiplicity of Galactic Cepheids from long-baseline interferometry V.
High-accuracy orbital parallax and mass of SU Cygni
Cepheid masses are particularly necessary to help solving the mass discrepancy, while independent distance determinations provide crucial test of the period-luminosity relation and Gaia parallaxes. We used CHARA/MIRC to measure the astrometric positions of the high-contrast companion orbiting the Cepheid SU Cygni. We also present new radial velocity measurements from …