Orbital Analysis of Separated Fringe Packet Binaries using the CHARA Array

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

One of the main objectives in creating the CHARA Array was to characterize binary star orbits in order to determine the masses of the individual stellar components. Primarily this was to be achieved by single parameter fits of the system's visibility curves. However, there arises a special case where the components of the system are close enough to produce multiple fringe packets. With the instantaneous length and position angle of the given baseline used in the observation, one can determine the on sky separation (15-900 milliarcseconds for the CHARA Array's baselines) and position angles for the individual components. For the four systems included in this discussion (HD 170153, 181655, 184467 and 198084), we show how the data collected fits with current spectroscopic and visual orbits and present two new orbital determinations for systems without previous orbits. Research at the CHARA Array is supported by the College of Arts and Sciences at Georgia State University and by the National Science Foundation through NSF Grant AST 0606958

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