July2014B.pub

Abstract

Abstract: Position angles and separations for 240 multiple star systems are presented using the video drift method. The drift method generates a Cartesian (x,y) coordinate pair for the primary and companion star for each video frame during the drift. Position angle and separation are calculated from these coordinates. Most doubles had multiple drifts observed over several nights resulting in 1,000's of (x,y) pairs analyzed per system. Several systems lacked measurements since the early 1900's or had less than 10 measurements since their discovery. The video drift method provides high systematic accuracy