R136a

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R136a is a compact star cluster near the center of the 30 Doradus complex (also known as the Tarantula Nebula), in the Large Magellanic Cloud.

The cluster contains, among other things, twelve very massive and luminous stars in its core. These stars are almost exclusively of spectral type O3, and had initial masses calculated to be in the range of 37 to 76 Mo[1].

  1. ^ Koter, Heap, and Hubeny. "An Empirical Isochrone of Very Massive Stars in R136A". The Astrophysical Journal. 
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