Spiral orbiting giant red star gives clues about end of sun’s life
Washington: An international team of astronomers have discovered an intriguing spiral structure surrounding a pulsing red giant star, which they believe may offer a preview of how the sun will behave at the end of its life.
The discovery was made using the Atacama Large Millimeter/Submillimeter Array (ALMA) in northern Chile, Live Science reported.
After the spiral structure, one never seen before, was found in the envelope of gas and dust around a red giant about 1,000 light-years from Earth, the team took a detailed three-dimensional reading of its composition.
The spiral is thought to be created from the gases being expelled by the dying red giant called R Sculptoris. The structure provides information about the velocity of the wind blowing off of R Sculptoris, revealing that the star has expelled three times as much mass as previously estimated.
“We can ‘walk along’ the spiral and use it as a clock to see what happened when,” said Matthias Maercker, of Germany’s University of Bonn.
Low- to intermediate-mass stars like the sun expand into red giants during the last stages of their evolution. (When the sun reaches this stage in about 5 billion years, its outer layer will spread as far as Earth’s orbit.)
Every 10,000 to 50,000 years, these gaseous behemoths burn helium for a few hundred years in a runaway process known as a thermal pulse, causing the layers of the star to mix.
“Thermal elements are an essential part of late stellar evolution. They are responsible for the formation of new elements, which eventually will get incorporated into new stars and planets,” Maercker told SPACE.com, a sister site to LiveScience, in an email.
These new elements take time to reach the outer layers of the star. By studying the corkscrewed expulsion from R Sculptoris, the astronomers calculated that the star was shedding more mass during thermal pulses than had been estimated.
“This means that much more mass is lost during a time where new elements cannot yet be incorporated into the wind. Hence it will take longer for these elements to be blown into space most likely, only during the next pulse,” Maercker said.
The spiral shape was caused by a companion star pushing through the layers expelled by T Sculptoris. The formation is allowing the scientists to study the history of the thermal pulses: Elements blown off at higher speeds create more widely separated spirals, while phases of slower mass loss are more tightly packed. The intensity of the spiral reveals how much mass was lost in each phase.
“Now that the companion star causes the spiral structure in the stellar wind from R Sculptoris, we can see it and, in a very detailed way, measure how it has evolved since the last thermal pulse,” Maercker said.
Located in the constellation Sculptor in the Southern Hemisphere, R Sculptoris is a typical red giant, so its evolution could provide a hint of what to expect from the sun down the road.
The research has been published in online version of the journal Nature.
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