南天的蟹状星云
影像来源与版权:NASA, ESA, STScI

说明:南天蟹状星云对称且多足的外观的确与众不同。它位于南天半人马座方向,距离我们约7000光年远,其炽热的沙漏形状是由位于其中心、壮观的共生双星系统形成的。该星云引人注目的双星是由一颗炽热的白矮星和一颗低温的脉动红巨星组成,而红巨星脱落的外层物质则落到更小、更炽热的伴星上。内嵌在物质盘中的白矮星爆发导致外流气体从盘面上方和下方流出,形成了双极的沙漏形状。明亮的中央形状跨度约为半光年。这幅刚发布的哈勃太空望远镜影像是为了庆祝哈勃望远镜在1990年4月24日搭载于发现号航天飞机上发射升空29周年。
翻译:北京天文馆

The Shape of the Southern Crab
Image Credit & Copyright: NASA, ESA, STScI

Explanation: The symmetric, multi-legged appearance of the Southern Crab Nebula is certainly distinctive. About 7,000 light-years distant toward the southern sky constellation Centaurus, its glowing nested hourglass shapes are produced by the remarkable symbiotic binary star system at its center. The nebula’s dramatic stellar duo consists of a hot white dwarf star and cool, pulsating red giant star shedding outer layers that fall onto the smaller, much hotter companion. Embedded in a disk of material, outbursts from the white dwarf cause an outflow of gas driven away both above and below the disk resulting in the bipolar hourglass shapes. The bright central shape is about half a light-year across. This new Hubble Space Telescope image celebrates the 29th anniversary of Hubble’s launch on April 24, 1990 on board the Space Shuttle Discovery.
Astronomy Picture of the Day 04/24/2019