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上海天文馆发现系外新星:寻找过程像大家来找茬


发布时间:2017-09-20 11:32:58 点击:10227


  如何找系外新星?跟“大家来找茬”差不多,在星空的新旧照片对比中,来寻找亮斑。

  9月20日,澎湃新闻(www.thepaper.cn)记者从上海科技馆获悉,近日,上海天文馆(上海科技馆分馆)建设指挥部展示教育主管施

施<span class=

  

  据施

  项目做法很简单,有点像“大家来找茬”

  施

  PSP项目运行以来,已经独立最先发现超新星/新星约30颗左右,有一批勤奋、认真、严谨的爱好者先后参与此项目并发现过属于自己的超新星。

新旧星系图对比。名字叫“新星”,实为一颗年老恒星

  通过PSP项目,施

  9月2日中午,他登录到PSP项目系统中,查看星明天文台于前晚及当天凌晨拍摄的数百张照片。

  突然,他在其中一张照片上找到了一个不起眼的小亮点,一个在旧照片上所不存在的点。这张照片是距离地球250万光年之遥的M31仙女座星系的一部分(M31又被称为仙女座星系,是最广为人知的星系之一,也是肉眼可见的最遥远的天体)。

  这个星点的亮度只有18.6等,比肉眼可见最暗的星还要暗约10万倍(天文学中用星等表示星星的亮度,数字越大表示亮度越暗)。他将这个可疑目标在照片上标出,向系统提交;与此同时,另外4名爱好者也分别独立发现了该目标。随后,系统管理员和其他爱好者查验后判定,极有可能是一颗新星,决定立即向有关机构上报。

  随后48小时内,位于广东的一个业余天文台宣布也拍到了这颗星,证实这的确是一个新的目标。但是根据国际惯例,必须拍摄到光谱才能确定这个天体的类型及其相关特性。施

  直到9月14日上午,当地时间9月13日晚,英国利物浦约翰摩尔斯大学的研究人员利用该校位于西班牙的2m口径“利物浦”望远镜观测并拍摄了该星的光谱。他们在快报中声称,在这颗恒星光谱中发现了很强的巴尔末氢线(Hα、Hβ、Hγ),以及多条 Fe II谱线,以及2条O I谱线,从而确认这是M31星系内一颗典型新星,光谱分类为Fe II型。由于得到了证认,这个新星也获得了正式编号M31N 2017-09a。

  据施

责任编辑:霍宇昂

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