"High-speed" stars are stars with enormous spatial velocity, which can in some
After the first was opened in 2005a high-speed star, more than 550 more similar to it were discovered with the help of several telescopes in 15 years. “More than 500 stars discovered this time doubled the total number of previously discovered objects. The total number of high-velocity stars now exceeds 1,000, ”said Dr. Li Yingbi, lead author of the study.
LAMOST, the largest optical telescope in China,collects data at the fastest rate in the world. He is able to observe about 4,000 celestial targets in one exposure. Regular research with the telescope began in 2012.
Gaia is a space mission within the scientificprograms of the European Space Agency (ESA), launched in 2013. She provided astrometric parameters for over 1.3 billion sources. “Two huge databases have provided us with an unprecedented opportunity to find as many high-speed stars as possible,” said Professor Luo Ali of NAOC, co-author of the study.
Nearly 600 high-speed stars foundturned out to be of low metallicity. This indicates that the bulk of the stellar halo was formed as a result of the accretion and tidal destruction of dwarf galaxies.
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