Stars Touching

The VTFS system, which is located in the Tarantula Nebula, was observed by the Very Large Telescope has recently discovered a double star system in which these two stars are overlapping and share as much as 30% of their mass.

These two stars orbit each other about once every day, resulting in an overcontact binary system. This phenomena is described by how they share a gaseous envelope where the gas does not rotate with the system itself. These are very large stars which have a combined mass of 57 times the mass of the sun as well as a high temperature of 4 x 10^5 degrees of Celsius.

It is very rare to find two stars that are connected in this manner since this state doesn't last very long and in this case, once the stars split it will have a catastrophic affect. Since these stars are orbiting each other so fast, the energy created will cause a long duration gamma ray burst which will result in both their deaths where they will continue to merge until they become one gigantic rotating star.

Sources:
http://www.daviddarling.info/encyclopedia/C/contact_binary.html
http://www.sciencealert.com/scientists-find-two-distant-stars-touching-and-the-results-could-be-catastrophic
https://en.wikipedia.org/wiki/Gamma-ray_burst#Ultra-long_gamma-ray_bursts