Characterizing binary properties of 5 m_⊙ stars: new approaches using cepheids

SAO, MS 4, 60 Garden St., Cambridge, MA 02138, USA

Abstract

Cepheids provide approaches to determining binary parameters which are often complementary to those for main sequence massive and intermediate mass stars. Specifically, we are using high resolution imaging, radial velocities, and X-ray studies to determine binary characteristics. Among the results are that they have both a high frequency of binary systems, and also a high proportion of triple systems.