The Astrometric Data for Composite Images and Orbital Binaries
In this chapter we examine the Hipparcos data for double and multiple star systems, some of which exhibit detectable orbital motions. Many of these systems had been included in the Hipparcos Input Catalogue for their astrophysical importance: a resolved double star system with well determined orbital parameters and an accurate parallax provides direct measurements of stellar masses, and in case the system also shows eclipses, stellar radii. The processing of Hipparcos data for double and multiple systems was, however, complex, and for multiple systems it required a priori information. The further complexities of a combination of orbital motion and duplicity stretched the interpretation possibilities of the data to the limit. Despite these complications, a large number of new binary systems, and even a number of orbital systems, were discovered and analysed using the mission data.
KeywordsAttenuation Zucker Bital
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