Massive Star WOH G64 Undergoes Unprecedented Transformation

WOH G64, one of the largest known stars located approximately 160,000 light-years away in the Large Magellanic Cloud, has undergone a significant transformation. Observations indicate that the star, previously classified as an extreme red supergiant, has transitioned to a yellow hypergiant, marked by an increase in surface temperature and a change in color from red to yellow.

This rapid evolution, occurring over a relatively short period, has puzzled astronomers. Gonzalo Muñoz-Sánchez, lead author of a study published in Nature Astronomy, stated,

"Typically, the evolution of a star takes place on timescales of billions of years. On human timescales, we only observe more abrupt and violent events, such as eruptions, the merger of two stars, or their explosive deaths."

The star's luminosity is approximately 300,000 times that of the Sun, and its diameter is about 1,500 times greater. If positioned at the center of our solar system, WOH G64's surface would extend between the orbits of Jupiter and Saturn.

Further complicating the understanding of WOH G64's behavior is the discovery that it is part of a binary system. The interaction with its companion star may have influenced its recent changes, though the exact nature of this relationship remains under investigation.

This unprecedented observation provides a unique opportunity to study the late-stage evolution of massive stars and may offer insights into the processes leading up to supernova explosions.