Extensive intermediate band and Hβ observations and the available astrometry, have been used to support the suggestions that (1) several southern concentrations of stars are moving with the Pleiades and α Persei clusters (Local Association) and (2) the Local Association contains an appreciable percentage of the main-sequence stars near the Sun but the non-random distribution of the brighter association members focuses attention on a few concentrations, or ‘clusters’. (3) All of the concentrations discussed are larger than about 10 pc and the largest, in Lupus–Centaurus, is shown to be accompanied by A to G type main-sequence stars.
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O. J. Eggen (1983) studied this question.