星团NGC 6397内的"怪胎"
[align=center][color=red][b]影像提供:[/b] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://urania.bo.astro.it/cdl/ricevimento/ferraro.htm&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhh_OKF_1FGOk9lpKXrpV9mXkQNTSw][color=red]Francesco Ferraro[/color][/url][color=red] ( [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.bo.astro.it/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhjmBrOSTLfccY2sJPU3mMof3LDxZg][color=red]Bologna Observatory[/color][/url][color=red] ), [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.esa.int/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiBFKkz1SKAiwHtA2klz3-pjF7PlA][color=red]ESA[/color][/url][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.nasa.gov/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiDdU0ZNt5wWZv75cjmsT3zvxWNSg][color=red]NASA[/color][/url][/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0202/ngc6397_hst_big.jpg[/img]
[color=green][b]说明:[/b]上面影像呈现了[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/globular_clusters.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhg_kQQNjjoPxSJtTh7tgm2Q2hmNsw][color=green]球状星团[/color][/url][color=green] NGC 6397的部份成员， [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://hubble.esa.int/hubble/gallery/new_searchresult.cfm%3Fooid%3D29458%26imgid%3D12986&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgKaqnTidxzwNNB_LpjotDrdZzrvA][color=green]其中有一颗恒星[/color][/url][color=green]正不停地眨眼呢。 [align=left]其实恒星亮度会发生变化并没有什么大不了，只不过它闪烁的频率非常快，而它的伴星极不寻常，让天文学家对它特别有兴趣。 [/align][align=left]有一种[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://hubble.esa.int/hubble/news/newsrelease.cfm%3Foid%3D29454&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhicsi7q3a2_cF8CCx4uCra2hlmnRg]理论认为[/url] ，它的伴星可能是颗[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.astro.umd.edu/~miller/nstar.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhg3Vdr4PeGtTYEVe0Rk8SUS8KNOtg]中子星[/url] ，来自主星(一颗[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/971016.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhhotMTNoAsC6Ac8PK5AGdYb0UjPiA]虚胖的红巨星[/url] )的物质，被中子星的重力牵引过来，形成一个[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap010508.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhj4fEcgCNfpwaNLf5iAI1W2p0xPNA]拱星盘[/url] ，盘内缘物质不停掉到中子星表面，让它的转速逐渐增加到每秒274圈，成为一颗[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.livingreviews.org/Articles/Volume1/1998-10lorimer/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiDoMu7_kFcEpcRBL-WYFH1yBN3bQ]毫秒波霎[/url] 。 [/align][align=left]这个奇特的系统，可能是因为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/glob.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiw0yeT7-eOZWm10bD7ORneft601w]球状星团[/url]中心的恒星很紧密， [url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap981128.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhhcq231nBoUehLQ3OaWpcOHILpnXA]中子星[/url]在和正常恒星近离互撞时，捕获这颗恒星所形成的。 [/align][align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap000622.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhifzGx6uR1J9nLbisvjyRHChzKZ6A]NGC 6397[/url]中心的恒星互撞，一般认为也是其他奇特恒星的形成机制，例如星团内[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap971104.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgLxpNfur7spiACDmI4OH7UmS4FvA]蓝掉队星(blue straggler)[/url]可能就是恒星碰撞的一种产物。 [/align][align=left]上面这张[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/xtra/ngc/n6397.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhh-SXqu91OD_VRqpfDFYwrAI3xuJQ]球状星团[/url]的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://hubble.esa.int/hubble/gallery/new_searchresult.cfm%3Fooid%3D29460%26imgid%3D12988&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhjbu4BPHgOrEPsB20ttDfavzKHRCQ]彩色影像[/url] ，是由[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap010806.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhicGgU86wNvSowOcoypfp6ec1tO-g]哈伯太空望远镜[/url]所拍摄的。[/color] ::42:: ::42:: ::42:: [size=2][color=magenta](转自成大天文学教室)[/color][/size][/align]
[[i] 本帖最后由 zheng123 于 2008-8-22 07:42 编辑 [/i]] 沙发。。
图片下载好慢啊
严重顶 同意楼上的观点，不过图片挺漂亮的，等的挺值！ “怪胎”在哪里啊？ 好图！！就是缺了个角未免有些遗憾啊，呵呵
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