The existence of the first generation of supermassive stars at the birth of the universe 13.8 billion years ago has always been a puzzle for the scientific community. Through years of research, Chinese researchers have discovered the chemical remains of the first generation of supermassive stars for the first time internationally, thereby proving the existence of the oldest stars in this type of universe. This is of great significance for exploring the origin and evolution of stars. The research achievement was published online in the international academic journal Nature on June 7th, Beijing time. In order to uncover the mystery whether the first generation of super massive stars exist, the scientific research team of the National Astronomical Observatory of the National Astronomical Observatories of China carried out relevant research work using the Guo Shoujing Telescope, a major national scientific and technological infrastructure located in Xinglong, Hebei Province. Through millions of Spectral class obtained by the telescope, researchers found that there was a star with a mass of about 0.5 Solar mass on the Milky Way halo, about 3327 light-years away from the Earth. Its metal element content was extremely low, which was in line with the characteristics of the second generation stars bred after the end of the first generation stars in theory. Xing Qianfan, associate researcher of the National Astronomical Observatory of the National Astronomical Observatories of China, introduced that they used more than 5 million Spectral class generated by LAMOST (Guo Shoujing Telescope) to find the star with the lowest magnesium content, obtain its high-resolution spectrum, compare it with the calculated value of the supernova theoretical model, and determine that these elements in this star are from the first generation stars with 260 times the Solar mass. According to reports, the first generation of Stellar mass can reach 140 to 260 times the mass of the Solar mass. They belong to super massive stars and are the oldest stars in the universe. These types of stars existed more than 13 billion years ago in the early stages of the universe's birth, but their lifespan was only about 3 million years. Subsequently, supernova explosions occurred, giving birth to the second generation of stars discovered by researchers. Associate Researcher Xing Qianfan vividly likened this scientific research work to discovering the characteristics of their parents' stars through the DNA of existing second-generation stars. The first generation star had many "children" (second generation stars), but the longest lived star among these "children" has lived to this day, with a lifespan of over 13 billion years. Our researchers have observed this "long-lived" star and, through their research, deduced the mass and properties of its previous generation of stars. Zhao Gang, a researcher at the National Astronomical Observatory of the National Astronomical Observatories of China, pointed out that the next step of the scientific research team will use the massive data of LAMOST (Guo Shoujing Telescope) to retrieve the distribution of stars with different masses of the first generation stars, and explore the evolution history of the entire universe and the evolution history of stars. (New News Agency)
Edit：Hou Wenzhe Responsible editor：WeiZe
Source：CCTV
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