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天龠六

蛇夫座51
观测资料
历元 J2000
星座 蛇夫座
星官 天龠
赤经 17h 31m 24.94s[1]
赤纬 −23° 57′ 45″[1]
视星等(V) 4.81[1]
特性
光谱分类B9

蛇夫座51(中文名天龠六)是一颗年轻的B型恒星,位于银河中心西北方的蛇夫座,距离地球约410光年(126秒差距)。值得注意的是,这是邻近的一颗"罕见、年轻的行星系统,刚进入行星形成最后阶段的一个例子"[2]

尘埃和气体盘

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蛇夫座51有一个气体和尘埃的盘面,似乎是一个年轻的岩屑盘,并且可能是在形成行星系统的最后阶段。这个系统有些性质类似于有巨大岩屑盘的一个著名恒星绘架座β:光谱类型、存在于边缘的气体和尘埃盘、和被认为是彗星掉落进盘面而呈现变化的蓝移吸收线[2][3]

蛇夫座51的距离远较绘架座β的远,它的岩屑盘相对的也更复杂。结果是,环绕着蛇夫座51的盘面需要干涉来解析;相对的,观察绘架座β只需要使用视讯光谱的影象[4]。最近使用凯克天文台的凯克干涉仪观测显示,蛇夫座51的盘面至少有两个部分:在中间的云是颗粒较大的(外星黄道尘),周围环绕着颗粒细小但更广大的颗粒,扩展至大约一千天文单位[3]。内盘的半径大约是地球到太阳距离的四倍,密度则是我们的太阳系内尘埃的十万倍[2]

相关条目

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参考资料

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  1. ^ 1.0 1.1 1.2 * 51 oph—Star. SIMBAD. [2009-09-23]. (原始内容存档于2014-04-13). 
  2. ^ 2.0 2.1 2.2 Twin Keck telescopes probe dual dust disks. e! Science News. 24 September 2009 [1 October 2009]. (原始内容存档于2010-01-13). 
  3. ^ 3.0 3.1 Stark, Christopher C.; Kuchner, Marc J.; Traub, Wesley A.; Monnier, John D.; Serabyn, Eugene; Colavita, Mark; Koresko, Chris; Mennesson, Bertrand & Keller, Luke D., 51 Ophiuchus: A Possible Beta Pictoris Analog Measured with the Keck Interferometer Nuller, Astrophysical Journal, 2009, 703 (2): 1188–1197, doi:10.1088/0004-637X/703/2/1188 
  4. ^ Smith, B. A. and Terrile, R. J. A circumstellar disk around Beta Pictoris. Science. 1984, 226: 1421–1424 [2010-04-14]. doi:10.1126/science.226.4681.1421. (原始内容存档于2017-11-03). 
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天龠六
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