NASA’s Kepler K2 Mission: “Reveals Sounds of Fossil Stars from the Early Universe”

 

 

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Astrophysicists from the University of Birmingham have captured the sounds of some of the oldest stars in our galaxy, the Milky Way, according to research published today in the Royal Astronomical Society journal Monthly Notices. The research team, from the University of Birmingham’s School of Physics and Astronomy, has reported the detection of resonant acoustic oscillations of stars in ‘M4’, one of the oldest known clusters of stars in the Galaxy (image above), some 13 billion years old.


Using data from the NASA Kepler/K2 mission, the team has studied the resonant oscillations of stars using a technique called asteroseismology. These oscillations lead to miniscule changes or pulses in brightness, and are caused by sound trapped inside the stars. By measuring the tones in this ‘stellar music’, it is possible to determine the mass and age of individual stars.

 

This discovery opens the door to using asteroseismology to study the very early history of our Galaxy. ‘We were thrilled to be able to listen to some of the stellar relics of the early universe,” said Andrea Miglio, at the University of Birmingham, who led the study. “The stars we have studied really are living fossils from the time of the formation of our Galaxy, and we now hope be able to unlock the secrets of how spiral galaxies, like our own, formed and evolved.”

‘The age scale of stars has so far been restricted to relatively young stars, limiting our ability to probe the early history of our Galaxy,” said Guy Davies, from the University of Birmingham’s School of Physics and Astronomy, and co-author on the study. “In this research we have been able to prove that asteroseismology can give precise and accurate ages for the oldest stars in the Galaxy ‘

“Just as archaeologists can reveal the past by excavating the earth, so we can use sound inside the stars to perform Galactic archaeology,” said Bill Chaplin, from the University of Birmingham, and leader of the international collaboration on asteroseismology.

The Daily Galaxy via University of Birmingham

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