KEY POINTS

  • Astronomers spotted the confrontation of two stars
  • The star system's red giant is on the verge of dying
  • A stellar collision produced a colorful nebula

Astronomers spotted a rainbow-colored gas cloud in space that was produced by a violent confrontation between two stars. According to the astronomers, the image shows a large star trying to consume a smaller one as it fights back.

The image of the stellar fight was taken by the Atacama Large Millimeter/Submillimeter Array (ALMA) telescope in Chile. It features the binary star system known as HD 101584.

According to astronomers from the European Southern Observatory (ESO), HD 101584 is inhabited by a massive central star that’s about to become a red giant. This means the star, which is similar to the Earth’s Sun, has already reached the end of its life and has depleted its fuel source.

As it enters this stage, the star goes through a chemical process that causes its outer layer to expand and shed. Eventually, only the core of the red giant will remain, which will become a dense stellar object known as a white dwarf. The ESO noted that the Sun will go through the same destructive process once it dies.

“For the Sun and stars like it, this change will take it through a phase where, having burned all the hydrogen in its core, it swells up into a large and bright red-giant star,” the ESO explained in a statement. “Eventually, the dying Sun will lose its outer layers, leaving behind its core: a hot and dense star called a white dwarf.”

As HD 101584’s red giant expanded it encountered its small neighboring star. According to astronomers, the red giant has already grown to a point that it became capable of consuming the smaller star. However, instead of being completely consumed by the red giant, the smaller spiraled into the core of its large neighbor.

“As the main star puffed up into a red giant, it grew large enough to swallow its lower-mass partner. In response, the smaller star spiraled in towards the giant’s core but didn’t collide with it,” the ESO explained. “Rather, this maneuver triggered the larger star into an outburst.”

This resulted in a powerful outburst that scattered the red giant’s outer layers. Through ALMA’s imaging capabilities, the outburst of gas, dust and other stellar materials produced a colorful nebula around the two stars.

HD 101584
This new ALMA image shows the outcome of a stellar fight: a complex and stunning gas environment surrounding the binary HD101584. The colours represent speed, going from blue — gas moving the fastest towards us — to red — gas moving the fastest away from us. Jets, almost along the line of sight, propel the material in blue and red. The stars in the binary are located at the single bright dot at the centre of the ring-like structure shown in green, which is moving with the same velocity as the system as a whole along the line of sight. Astronomers believe this ring has its origin in the material ejected as the lower mass star in the binary spiralled towards its red-giant partner. ALMA (ESO/NAOJ/NRAO), Olofsson et al.