Welcome
The SAGE Group, was founded at the start of the Knowledge Innovation Project of the National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) in 1999. We utilize telescopes around the world to obtain high-resolution spectra of stars, to research chemical abundances, search for metal-poor stars and extrasolar planets, study Galactic structure and evolution, etc. Besides, we have achieved great progresses in laboratary astrophysics and related fields.
Research
News
A moving group is a group of stars with similar age, metallicity, and velocity, provide important proofs for the research of the Galactic origin and evolution. Based on kernel estimation and wavelet analysis, we have identified 22 moving group candidates, from over 14,000 dwarfs and 6,000 giants in the solar neighborhood.More
Research
High-resolution spectra of stars are observed to determine their chemical abundances, age and kinematics, to study different stellar populations, structure and evolution of the Galaxy, to understand the nucleosynthesis theory, and to verify cosmological models.
As a new interdiscipline, laboratory astrophysics simulates high-energy and high-density environment under the astrophysical conditions in the laboratory, to study radiation opacity, state equation of stellar interior substance, jet and shock wave, etc.
Members of a star cluster have similar age, metallicity and distance, thus are uncommon "controlled experiments". We examine the age, kinematic state, metallicity and the ratio of binaries, to promote the understanding of galactic evolution and the process of chemical enrichment.
Metal-poor stars preserve chemical information of the early universe, and thus regarded as the fossil recording history of the universe. Researches on extremely metal-poor stars enable us to understand the early stage of the Big Bang, and to investigate the origin of chemical elements.
We search for exoplanets and brown dwarfs around the late G, K-type giants with the 2.16m telescope and high-resolution spectrograph in Xinglong, and study the differences in chemical abundances between stars with and without planets.