国产精品99一区二区三_免费中文日韩_国产在线精品一区二区_日本成人手机在线

Astronomers find evidence of Milky Way "swallowing up" dwarf galaxy

Source: Xinhua| 2019-04-30 15:34:28|Editor: Li Xia
Video PlayerClose

BEIJING, April 30 (Xinhua) -- A team of Chinese and Japanese astronomers found that a special star within the Galactic halo was originated from a dwarf galaxy, which was disrupted and "swallowed up" by the Milky Way.

Small stellar systems like dwarf galaxies are believed to be the main building blocks of our Galaxy. However, it is unclear how many and what kind of stars in our Galaxy are originated from satellite dwarf galaxies, said astronomers.

A research team led by Zhao Gang, an astronomer from the National Astronomical Observatories, discovered a chemically peculiar star which has an unusually low amount of magnesium, but contains an excessive amount of heavy elements, such as europium, gold and uranium.

"This is the first discovery of a Galactic star having a very low amount of magnesium and an excessive amount of heavy elements," said Li Haining, a member of the research team.

"Stars preserve in their outer layer chemical information of their birth place. We can distinguish stars formed in the Milky Way from those formed in dwarf galaxies based on their chemical abundances," Zhao said.

The chemical composition of the special star shows that it is originated from a dwarf galaxy, which was disrupted by interaction with the Milky Way, Zhao said.

The research, based on data obtained by China's Large Sky Area Multi-Object Fiber Spectroscopic Telescope and Japan's Subaru telescope, was published online in the latest issue of Nature Astronomy.

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011100001380249811
主站蜘蛛池模板: 清涧县| 莱西市| 永城市| 师宗县| 汉寿县| 绥化市| 长兴县| 淮滨县| 山阴县| 阳城县| 溧水县| 延庆县| 华阴市| 六盘水市| 海盐县| 含山县| 醴陵市| 北碚区| 海淀区| 普陀区| 湖口县| 都江堰市| 桂林市| 崇文区| 资兴市| 宝应县| 石渠县| 湖南省| 周宁县| 新巴尔虎右旗| 济源市| 信阳市| 松滋市| 历史| 南京市| 盐源县| 武平县| 泽州县| 克山县| 年辖:市辖区| 昌平区|