R136a1

R136a1 is one of the most massive and luminous known stars.An outstanding illustration is at Amos, Jonathan 2016. Hubble telescope spies stellar 'land of giants'. BBC News Science & Environment.  It is a Wolf–Rayet star at the center of R136. 

R136 is the central group of stars of the large NGC 2070 open cluster in the Tarantula nebula. The nebula lies about 50 kiloparsecs (163,000 light-years) in the Large Magellanic Cloud. 

R136a1 has nearly 300 the mass of the Sun, and 4.7 million times its luminosity. It is also one of the hottest at over 50,000 K.Crowther P.A. et al 2016. The R136 star cluster dissected with Hubble Space Telescope/STIS. I. Far-ultraviolet spectroscopic census and the origin of He II λ1640 in young star clusters. Monthly notices of the Royal Astronomical Society.   The cluster is only about 1.5 million years old, and is pouring out a huge amount of energy. Together, they outshine our Sun by a factor of 30 million.

The star is the largest of eight huge stars in the cluster.

 References 

Category:Stars