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The stellar IMF has been found to be an invariant Salpeter power-law (α=2.35) above about 1 M , but at the same time a massive star typically has more than one companion. This constrains the possible formation scenarios of massive stars, but also implies that the true, binary-star corrected stellar IMF could be significantly steeper than Salpeter, α>2.7. A significant fraction of all OB...
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