打破物理铁律：天文学家发现首颗绿色恒星，距离地球约 280 光年

IT House reported on October 21 that according to CCTV News Global Information Broadcast, a team of astrophysicists from the University of Warwick in the UK discovered for the first time a star that would appear light yellow-green if viewed with the naked eye - WD J1330+6435 by analyzing the spectral data of white dwarfs. The research was recently published in the international academic journal "RAS Technology and Instrumentation" (RASTI). ▲ Picture source: From the official website of the University of Warwick, UK | Simulation of a green star. According to reports, this green star is located in the Draco constellation of the Milky Way, about 280 light-years away from the earth. It is not a young and healthy star, but a white dwarf. White dwarfs are the final stage of stellar evolution. They are the dense core left behind after a star has reached the end of its life and exhausted its fuel, which is the so-called stellar debris. Mark Hollands, an astrophysicist at the University of Warwick in the United Kingdom and the first author of the paper, said that the color of most stars depends on the temperature and is limited to orange, white or blue. He said: "The same is true for most white dwarfs, but some white dwarfs will show extremely rich and diverse colors." IT Home Note: The light emitted by stars is not a single color, but a continuous spectrum covering all wavelength bands - like a continuous rainbow, with red, orange, yellow, green, blue and violet, but with different strengths. Green is special because it is located in the middle of the spectrum. Therefore, normal stars are not "purely green". For a star to appear pure green, it must be extremely strong in the green light band and extremely weak in the orange and blue bands, which is simply not possible in the continuous spectrum. WD J1330+6435 breaks the idea that temperature determines color. In a press release on the official website of the University of Warwick, the research team wrote: "Color is not only determined by temperature, but also related to density." This white dwarf is about the same size as the Earth and has a mass of 165,000 times that of the Earth. At this extreme density, its atmosphere is very dense. Boris Gansik, co-author of the paper and astrophysicist at the University of Warwick in the UK, added that this "green" is not the color directly captured by the telescope, but the research team input spectral data and calculated it based on the human visual model.