The fate of galaxies is determined by the initial mass distribution at the birth of a new population of stars in the diverse and vast Universe. This relationship is referred to as the Initial Mass Function (IMF). For over 50 years, astronomers have believed that the IMF is a universal relationship,
New research reveals that the mass of newly born stars varies with their metal abundances and their birth time . Credit: Wu Kun
Now, based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope , a research team led by Prof. Liu Chao from the National Astronomical Observatories of theThe study was recently published in the journal“The IMF varies with levels of metal elements, and populations of stars born earlier in the Universe’s history contain fewer low-mass stars than younger populations,” said Li Jiadong, a Ph.D. student at NAOC and first author of the study.
“Although many previous studies applied star counting to derive the IMF, two problems have not been solved. One is that only a small number of stars were counted in previous work. The second is that previous studies did not measure the metallicity of stars,” said Prof. Zhang Zhiyu, co-author of the study.
The study has revealed the variable abundance of low-mass stars in our galaxy, the Milky Way, and established a powerful benchmark for models of star formation. The findings may also affect the results of models of chemical enrichment of distant galaxies, as well as estimates of galaxy mass and the efficiency of planet formation.
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