Summary
Great technical improvements have been achieved during latest decades in binary star research (angular resolution, photometry, radial velocities). Consequently, there is now a significant overlapping among the traditional groups. Furthermore, we can tackle the study of couples where the companion is a submassive object.
More attention is now devoted to multiple systems, their structure and evolutionary story.
The scenario is now ready for a new insight into the problem of formation and evolution of stars.
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Fracastoro, M.G. The concept of star multiplicity and its historical evolution. Astrophys Space Sci 142, 11–15 (1988). https://doi.org/10.1007/BF00656175
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DOI: https://doi.org/10.1007/BF00656175