China’s astronomers discover ‘591’ high-velocity stars
Published: 01:26 PM, 28 December 2020
A Chinese research team has discovered 591 high-velocity stars based on data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) and the European Space Agency’s Gaia satellite.
According to AFP, high-velocity stars are the stars that move unusually quickly, relative to other stars, and may at some point leave their galaxy. Of the newly discovered stars, 43 may escape the gravitational constraints of the Milky Way galaxy in the future and fly into intergalactic space.
A total of over 550 high-velocity stars had been found since the first one was discovered in 2005.
“The new discovery has doubled the total known number,” said Li Yinbi with the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC), lead author of the research.
Lu Youjun, a researcher at the NAOC, said, “High-velocity stars can provide deep insights into a wide range of topics within galactic science, from the central supermassive black hole to the distant galactic halo.”
The researchers analyzed the chemical and kinematic properties of the 591 high-speed stars and found that they are inner-halo stars.
“Their low metallicities indicate that the bulk of the stellar halo formed as a consequence of the accretion and tidal disruption of dwarf galaxies,” said Zhao Gang, also a researcher at the NAOC.
The discovery was recently published in the Astrophysical Journal Supplement Series.