遥远的疏散星团M103
[align=center][b][color=red]影像提供与[/color][/b][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/scope/copyright.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=ALkJrhixEM_J3OL4YsOyPiZlYhSrMEO3Xw][b][color=red]版权[/color][/b][/url][color=red] : Hillary Mathis & [/color][email=nsharp@noao.edu][color=red]NA Sharp[/color][/email][color=red] , [/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/image_gallery/html/im0297.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=ALkJrhi1R0bbs_ljSVahTrDx4la1KY-Kig][color=red]KPNO 2.1-m Tel.[/color][/url][color=red] , [/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.aura-astronomy.org/&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=ALkJrhi642LREa26fEvn-R5Tvrj1VUhUXA][color=red]AURA[/color][/url][color=red] , [/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/&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=ALkJrhgEaZXnzNENeH7Ov7zJRXP8qMivag][color=red]NOAO[/color][/url][color=red] , [/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.nsf.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=ALkJrhhWkphmMLVAvpX_FkMR6QfmrYlBjw][color=red]NSF[/color][/url] [/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0102/m103_kpno_big.jpg[/img]
[color=green][b]说明:[/b]蓝色的亮星们是疏散星团[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/m/m103.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=ALkJrhhvSuntLSZfPVcTEFS9t6Hxkiy7-Q][color=green]M103[/color][/url][color=green]中最突出的一群。 [align=left]疏散星团中的恒星们是由一团[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap000924.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=ALkJrhjvESPaFsYL8B6jPfWAAD1DYPTUYg]云气[/url]慢慢地凝结出来的，而且这些星也会慢慢地散开。 [/align][align=left]在已形成的恒星中，最亮最蓝也是最重的恒星，早已[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://observe.ivv.nasa.gov/nasa/space/stellardeath/stellardeath_intro.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=ALkJrhjL0THNCXoWGDg3fVnExGKenXcGfg]耗尽它的核燃料[/url] ，并且在一次[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://heasarc.gsfc.nasa.gov/docs/snr.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=ALkJrhgjdpubx_iJhLjTA3KF6XvUjU0wDA]超新星爆炸[/url]中自我毁灭。 [/align][align=left]根据理论计算的推论，M103中最亮的[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://zebu.uoregon.edu/~js/ast122/lectures/lec15.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=ALkJrhgnJrqUrOrfRIx17B3po__F6LyH6w]主序星[/url]的生命期大约是二千万年，也就是在二千万年前，就可以看到M103中最亮的主序星了。 [/align][align=left]事实上， [url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/image_gallery/html/im0635.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=ALkJrhiiK_c5Vk6PE8pktqc875KmWMqFVg]在上面的那一张照片中[/url]星团的中央附近，就可以看到一颗前身是蓝色的主序星，但如今已经离开了[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://antwrp.gsfc.nasa.gov/htmltest/gifcity/msblues.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=ALkJrhjUKKYpVzIU-tW7J_K7gs_a4RYGYg]主序带[/url]而演变成为[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://zebu.uoregon.edu/~js/ast122/lectures/lec17.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=ALkJrhgxUQ7HSAzAYKB00EcliyMk-IqGKA]红巨星[/url] 。 [/align][align=left]一般而言，与大质量的蓝色恒星相比，类似[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/sun.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=ALkJrhhuungQu5e4PKmab2PupIIndjerGQ]太阳[/url]的黄色恒星在[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/open_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=ALkJrhiyHVfguYlEUYRjdtEIDo9j8vjggQ]疏散星团[/url]中是比较暗而且也比较不明显的。 [/align][align=left]用双筒望远镜可在[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.astronomical.org/constellations/cas.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=ALkJrhgQDRuUXAaquoP8uoJjNaveg_Fttg]仙后[/url] [url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/Maps/Const/constS.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=ALkJrhiO6rRiGZpzStYNnhHnJd7lJGhU8g]座[/url]方向找到的[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.e-z.net/~haworth/messier/m103.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=ALkJrhh0N1ZMZ2N9QWeGROqDq5bi0OaZvA]M103[/url] ，它横跨的范围约14 [url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/cosmic_distance.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=ALkJrhh4EF0L4ILDkb0rd6qT1JAGhMJosw]光年[/url] 。 [/align][align=left]然而，由于[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://adsabs.harvard.edu/cgi-bin/nph-bib_query%3Fbibcode%3D1999A%2526A...349..448S&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=ALkJrhi5DcGAp5eR3flzyxGvWcB8KOzZNw]它与地球相距有8000光年之遥[/url] ，所以它在夜空中看起来的大小，要比[url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap000113.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=ALkJrhhw3WxJ9OSJjtAx3--OopGIehGZZA]满月[/url]小四倍。[/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 2008-8-25 01:00 编辑 [/i]] 好图，我要慢慢欣赏里面其中的星系::42:: ::42:: ::42:: ::42:: 彩色的星团啊!有黄和蓝色的星!不错!!::42::
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