M39天鹅座的疏散星团
[align=center][b][color=red]影像[/color][/b][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/image_gallery/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=ALkJrhg9Heyh80U0orqHGuSzbBty4z6cIg][color=red][b]版权[/b][/color][/url][color=red][b]与提供:[/b] [/color][email=%20hschweiker%20at%20noao.edu][color=red]Heidi Schweiker[/color][/email][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/wiyn/wiyn.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=ALkJrhgOk3-zmFTnXjEeQPJodZXTscGdxA][color=red]WIYN[/color][/url][color=red] , [/color][url=http://203.208.39.99/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=ALkJrhgW6w5qgj9iAsY0UhWBHn9giew82g][color=red]NOAO[/color][/url][color=red] , [/color][url=http://203.208.39.99/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=ALkJrhjNkxMSU__hNvEygaLoXPfSik1_yw][color=red]AURA[/color][/url][color=red] , [/color][url=http://203.208.39.99/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=ALkJrhhDXxCabk9lQP3MnaLI6bL9slH_fA][color=red]NSF[/color][/url] [/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0403/m39_noao_big.jpg[/img]
[color=seagreen][b]说明:[/b]刚好在人类裸视极限的M39，是北方天空一个很美丽的大型[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://seds.lpl.arizona.edu/messier/open.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=ALkJrhiw9A1wp90Dc7woFueLYOnHfe3PvQ][color=seagreen]疏散星团[/color][/url][color=seagreen] 。 [align=left]位在[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.astro.wisc.edu/~dolan/constellations/extra/constellations.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=ALkJrhjnPnHzv6pDYoqgT7WGANIv82RYxg]北天[/url] [url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.astro.wisc.edu/~dolan/constellations/constellations/Cygnus.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=ALkJrhjfXvTehfiXpGjpv3qkUvEagTUSaA]天鹅座[/url]内的M39，离我们约有800 [url=http://203.208.39.99/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=ALkJrhiZylCRaKgqsBkfJv71xvIZZy_-LQ]光年[/url]远，它内部为数不多的恒星占住了比满[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap030810.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=ALkJrhgQsQ5uFpyTtPanwMKNb66rJiwcqQ]月[/url]略大的天区。 [/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/m/m039.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=ALkJrhh2WjfARZF85YqPoN3zyjEcJnJbkw]M39[/url]的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/image_gallery/html/im0854.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=ALkJrhjIqc-tpL4nUB9oa848x04TCAAYQA]影像[/url] ，是从33幅[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/wiyn/&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=ALkJrhi2k_-3R9PUTqLC0HMeNj1APj1cVg]WIYN[/url]望远镜照片所组成出来的，拍摄地点是[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.cia.gov/cia/publications/factbook/geos/us.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=ALkJrhiYR9dJuaQfrLtdwy_u1qyDT-vqVA]美国[/url] ． [/align][align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.state.az.us/&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=ALkJrhiE5jAo1MkVvthxfaS_KpzB6bL7Iw]亚利桑那州[/url]的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap990118.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=ALkJrhj5dXYK_Yx_Cc9oaXHqseSi8LZ77g]基特峰(Kitt Peak)[/url] 。 [/align][align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://adsabs.harvard.edu/cgi-bin/nph-bib_query%3Fbibcode%3D1991A%2526AS...87..419M&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=ALkJrhjSTctG9SU78owY-L4gKgZmmQVdVQ]M39[/url]成员恒星的年龄大约都是三亿年，远比[url=http://203.208.39.99/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=ALkJrhiK7S-J6-eabfOwrsOlcD6E4aT5gw]大阳[/url]的五十亿年要年轻。 [/align][align=left]疏散星团也称为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.cpither.freeserve.co.uk/galactic_clusters.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=ALkJrhgvK7CpDwuukW364XWzAXwzKg8r9A]银河星团[/url] ，它们的成员星比[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=ALkJrhhKZuiwOqV4C5wLPOKR0GU-kPTOlg]球状星团[/url]年轻，数量也较少。 [/align][align=left]另一项异于球状星团的特点是， [url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://en.wikipedia.org/wiki/Open_cluster&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=ALkJrhjmUKtoXP0I1vAVze8EJvrPR4BUeg]疏散星团[/url]通常位在[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap990224.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=ALkJrhgd3VrnxKEoFRthhDGfWWhuuhR1QA]银河系的盘面[/url]上。[/color] ::42:: ::42:: ::42:: [size=2][color=magenta]（转自成大天文学教室）[/color][/size][/align]
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