Sub-Milliarcsecond Optical Astrometry and Binary Stars [chapter]

J. T. Armstrong
1995 Astronomical and Astrophysical Objectives of Sub-Milliarcsecond Optical Astrometry  
Long-baseline optical interferometry has made it possible to measure the visual orbits of binary stars with major axes as small as 5 mas and errors of ^ 100 //as. Interferometers now nearing completion will extend these values to a ^ 500 //as and a a ~ 10 //as. Observations of double-lined spectroscopic binaries with current interferometers have already yielded some mass estimates with precisions rivaling those from fitting the light curves of eclipsing double-lined systems. Luminosity
more » ... Luminosity estimates based on combined visual interferometric observations and velocity curves are often more precise than those from more indirect methods based on estimates of T e ff. New interferometers now coming into operation will make it possible to measure fundamental parameters in dozens to hundreds of binary systems. 193
doi:10.1007/978-94-011-0069-4_32 fatcat:nhkrfpbtfnfwdia6lrmctbmzci