Abstract
Starting with the earliest studies of the distribution of the bright stars by Kapteyn, Rasmuson, and Pannekoek ([80], [81], [110], [118], and [119]), it was evident that O and B stars are not distributed randomly on the sky, but instead are concentrated in loose groups, which were subsequently called ‘OB associations’. This inspired research on their individual properties, and on their motions and space distribution. From dynamical considerations it followed that OB associations must be young [4], a conclusion supported later by the ages derived from color-magnitude diagrams. Blaauw’s 1964 review [9] already discussed the relation between OB associations and interstellar matter. Subsequent observations of molecular clouds (e.g., [151], [16]) indicated that these groups are usually located in or near star-forming regions, and hence are prime sites for the study of star formation processes and of the interaction of early-type stars with the interstellar medium.
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Brown, A.G.A., Blaauw, A., Hoogerwerf, R., De Bruijne, J.H.J., De Zeeuw, P.T. (1999). OB Associations. In: Lada, C.J., Kylafis, N.D. (eds) The Origin of Stars and Planetary Systems. NATO Science Series, vol 540. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4509-1_12
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