Here are the names of the astronomers who discovered the cause of the blue light:

Dr. Van Genderen and his colleagues, Dr Alex Lobel from the Royal Observatory of Belgium and Dr Hans Nieuwenhuijzen from SRON Laboratory for Space Research, reveals the light was caused by PAH (polycyclic aromatic hydrocarbon) molecules.

Ah PAH (polycyclic aromatic hydrocarbon) molecules should have known. 😉

And here is a cool video about this fascinating star and a bit more about it:

It is also in the top ten of the largest stars known — 50% larger than the famous red supergiant Betelgeuse — and about one million times brighter than the Sun.

thanks to sci-news.com for the great info