  New instrumentation is providing new insights into intermediate mass
pulsating Cepheids, particularly about their formation and history. Three
approaches are discussed, using space (Hubble and Chandra) and ground-based
studies (radial velocities). First, we are conducting a survey of Cepheids with
the Hubble Space Telescope Wide Field Camera 3 (WFC3) to identify possible
resolved companions (for example Eta Aql) and thus provide constraints on star
formation. Followup X-ray observations (Chandra and XMM-Newton) can confirm
whether possible low mass companions are young enough to be physical companions
of Cepheids. In a related study of intermediate mass stars, Chandra X-ray
observations of late B stars in Tr 16 have been used to determine the fraction
which have X-ray active low mass companions. Finally, the Tennessee State
Automatic Spectroscopic Telescope AST and the Moscow University group have
obtained velocities of a number of Cepheids. As an example, the orbit of V350
Sgr has been redetermined, providing a new level of accuracy to the orbital
velocity amplitude, which is needed for mass determination.
