Vol. 552
In section 7. Stellar structure and evolution

Multiplicity of Galactic Cepheids from long-baseline interferometry. I. CHARA/MIRC detection of the companion of V1334 Cygni

The authors performed interferometric observations of the first-overtone mode Cepheid V1334 Cyg with the CHARA/MIRC combiner, and detect the signature of a companion orbiting V1334 Cyg at two epochs. The combination of interferometric and spectroscopic data allows them to determine the orbital elements. They also derive a minimal distance of 691 pc, a minimum mass for both stars of 3.6 Msun, and a spectral type earlier than B5.5V for the companion star.