It was previously considered that old, evolved stars do not interlope with young stars and their planetary systems.
The interaction between the evolved and young stars took place in a region where scientists believe stars, like our Sun, form. These interloping stars did not form in this particular area, but they were observed traveling across it.observatory, which was launched with the purpose of locating billions of stars in our home galaxy, detected this unexpected finding.
“Gaia is revolutionizing our ideas about how stars form, and then subsequently move in the Galaxy. This discovery of an old, evolved star in close proximity to young planet-forming stars is a wonderful example of the power of serendipity in scientific research,” said Christina Schoettler, who found the retired AGB stars in the Gaia data.generate high amounts of radioactively unstable chemical elements, including aluminium-26 and iron-60.
It could be possible that such types of stars delivered these chemical elements to the young solar system while the planets, including Earth, were still forming. And may have had a big role in the early internal heating of our planet's core. Additionally, as per the study, aluminium-26 and iron-60 may have aided plate tectonics on our planet.
“By showing that AGB stars can meet young planetary systems, we have shown that other sources of Aluminium-26 and Iron-60, such as the winds and supernovae of very massive stars, may not be required to explain the origin of these chemical elements in our Solar System,” explained Parker. Following this study, the team plans to look for further interactions between retired stars and nascent star-forming areas to see if this is a typical occurrence.Short-lived radioisotopes, in particular 26Al and 60Fe, are thought to contribute to the internal heating of the Earth, but are significantly more abundant in the solar system compared to the interstellar medium.
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