Ivanov V. D. , Chauvin G. , Foellmi C. , Hartung M. , Huelamo N. , Melo C. , Nuernberger D. , andSterzik M.
COMMON PROPER MOTION SEARCH FOR FAINT COMPANIONS AROUND EARLY-TYPE FIELD STARS (Poster)

COMMON PROPER MOTION SEARCH FOR FAINT COMPANIONS AROUND EARLY-TYPE FIELD STARS

Ivanov V. D. , Chauvin G. , Foellmi C. , Hartung M. , Huelamo N. , Melo C. , Nuernberger D. , andSterzik M.
European Southern Observatory, Alonso de Cordova 3107, Santiago, CHILE

The derived binary fraction of early-type stars is different for individual star forming regions, suggesting a connection with the age and the environment conditions. The few studies that have investigated this connection do not provide conclusive results. To fill in this gap, we started a detailed adaptive-optic-assisted imaging survey of early-type field stars to derive their multiplicity in a homogeneous way. The sample has been extracted from the Hipparcos Catalog and consists of 341 BA-type stars within $\sim$300 pc from the Sun. We report the current status of the survey and describe a Monte-Carlo simulation that estimates the completeness of our companion detection. Finally, the first results from our second epoch observations of stars with companion candidates are discussed.