加载中…太空望远镜观测到年轻星体频频闪光
(2013-02-15 10:52:11)
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分类： 科学与技术 |
http://photos.state.gov/libraries/amgov/3234/week_1/02072013_pia16689-640-600.jpg
美国国家航空航天局的两大天文台通过斯皮策太空望远镜和哈勃太空望远镜联合对一颗像频闪灯一样闪光的神秘的“婴儿期”星体进行了观测。
美国国家航空航天局（NASA）的两大天文台通过斯皮策太空望远镜（Spitzer Space Telescope）和哈勃太空望远镜（Hubble Space Telescope）联合发现了一颗像频闪灯一样闪亮的神秘的“婴儿期”星体。
这颗被命名为LRLL54361的星体每隔25.34天便会发出闪光。虽然此前也曾在另外两颗年轻星体上观测到类似现象，但是LRLL54361是迄今为止观测到的闪光最强烈的星体。
发光的中心被一个厚厚的星盘和云尘遮挡。天文学家判断这些闪光是由于两颗互为双子星或在引力作用下附着在一起的新生星体定期互动所致。LRLL54361让人类对星体形成的早期阶段——大量气团和云尘快速积聚或相互聚合产生新的双子星——有了更深入的了解。
上图为一对此类年轻双子星及其周围的星盘云尘和气团的示意图。
天文学家计划使用包括欧洲航天局（European Space Agency）的赫歇尔天文台（Herschel Space Observatory）在内的其他设施继续对LRLL54361进行观测。他们希望最终获得更多的对该双子星及其运行轨道的直接观测数据。
有关这个闪光星体及相关研究的更多内容，请参阅美国国家航空航天局新闻简报。
Read more: http://iipdigital.usembassy.gov/st/chinese/inbrief/2013/02/20130208142304.html#ixzz2KvsWsnUL
Telescopes Discover Strobe-Like Flashes in Young Stars
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Two of NASA’s great observatories, the Spitzer and Hubble space telescopes, have teamed up to uncover a mysterious infant star that behaves like a strobe light.
Two of NASA’s great observatories, the Spitzer and Hubble space telescopes, have teamed up to uncover a mysterious infant star that behaves like a strobe light.
Every 25.34 days, the object, designated LRLL 54361, unleashes a burst of light. Although a similar phenomenon has been observed in two other young stellar objects, this is the most powerful such beacon seen to date.
The heart of the fireworks is hidden behind a dense disk and an envelope of dust. Astronomers propose the light flashes are caused by periodic interactions between two newly formed stars that are binary, or gravitationally bound to each other. LRLL 54361 offers insights into the early stages of star formation when lots of gas and dust is being rapidly accreted, or pulled together, to form a new binary star.
Above is an artist’s conception of such a pair of young stars and a disk of dust and gas around them.
The astronomers plan to continue monitoring LRLL 54361 using other facilities, including the European Space Agency’s Herschel Space Observatory. The team hopes to eventually obtain more direct measurements of the binary star and its orbit.
For more on the beacon and the research into it, see the NASA press release.
Read more: http://iipdigital.usembassy.gov/st/english/inbrief/2013/02/20130207142250.html#ixzz2Kvsa9Ztq
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