邻近星系中爆炸的恒星
Exploding star in nearby galaxy[color=blue]邻近星系中爆炸的恒星[/color]
1 April 2008
The latest image from the NASA/ESA Hubble Space Telescope reveals a sharp view of the spiral galaxy NGC 2397. It shows a rare Hubble view of the early stages of supernova SN 2006bc, discovered in March 2006.
[color=blue]2008年4月1日
NASA/ESA “哈勃”空间望远镜最新的图像清晰的展示了旋涡星系NGC2397的景象。展现了超新星SN2006bc早期形态的珍贵景象。[/color]
[img]http://esamultimedia.esa.int/images/hubble/heic0808a_H1.jpg[/img]
NGC 2397 is a classic spiral galaxy with long, prominent dust lanes along the edges of its arms, seen as dark patches and streaks silhouetted against the starlight. Hubble’s exquisite resolution allows the study of individual stars in nearby galaxies.
[color=blue]NGC2397是一个典型的漩涡星系，在旋臂的边缘有着长而显著的尘埃线，如同在星光映衬下的斑块与条纹的剪影。“哈勃”细致的解析度使我们得以研究邻近星系中单独的恒星。[/color]
Located nearly 60 million light-years away from Earth, NGC 2397 is typical of most spirals, with mostly older, yellow and red stars in its central portion, while star formation continues in the outer, bluer spiral arms. The brightest of these young, blue stars can be seen individually in this high-resolution view from Hubble’s Advanced Camera for Surveys (ACS).
[color=blue]位于距地球将近6千万光年的NGC2397是众多漩涡星系中典型的一个，核心处有着最古老的黄色和红色恒星，在外围蓝色的旋臂处仍在产生恒星。在“哈勃”高级巡天相机（ACS）拍摄的这幅图片中可以看到这些最亮的蓝色恒星个体。[/color]
[img]http://esamultimedia.esa.int/images/hubble/heic0808b_H1.jpg[/img]
One atypical feature of this Hubble image is the view of supernova SN 2006bc taken when its brightness was on the decrease. Astronomers at Queen's University Belfast in Northern Ireland, led by Professor of Astronomy Stephen J. Smartt, requested the image as part of a long project studying massive exploding stars — supernovae. Exactly which types of stars will explode and the lowest mass of star that can produce a supernova are not known.
[color=blue]图像中一个不寻常的特征就是所拍到的光度正在降低的超新星SN2006bc。由天文学教授 Stephen J. Smartt 所领导的来自北爱尔兰贝尔法斯特女王大学的天文学家们为一个长期项目——大质量爆发恒星的研究申请获得这幅图片。严格的来讲什么样类型的恒星会爆炸以及可以产生超新星的质量下限现在还不清楚。[/color]
When a supernova is discovered in a nearby galaxy, the group begins a painstaking search of earlier Hubble images of the same galaxy to locate the star that exploded later; often one of hundreds of millions of stars in the galaxy. This is a little like sifting through days of CCTV footage to find one frame showing a suspect.
[color=blue]一旦在邻近星系中发现了一颗超新星，该小组就开始在“哈勃”拍摄的同一星系较早图片中进行艰苦的搜寻，以定位爆发前的这颗恒星；一个星系中通常有着上亿的恒星。这有点儿像通过搜索几天的闭路探头录像寻找一个画面中的疑犯一样。
[/color]
If the astronomers find a star at the location of the later explosion, they may work out the mass and type of star from its brightness and colour. Only six such stars have been identified before they exploded and Smartt’s team have discovered the nature of five of them.
[color=blue]如果天文学家在先前的爆发位置找到一颗恒星，他们可以根据恒星的亮度和颜色计算出它的质量和恒星类型。只有六颗这样的恒星被确认出来，Smartt 的小组已经发现了其中5颗的本性。[/color]
In their latest work on Hubble images, to be presented at the UK National Astronomy Meeting 2008 in Belfast, the team reveals the results of their ten-year search for these elusive supernova precursor stars. It seems that stars with masses as low as seven times the mass of the Sun can explode as supernovae. The team have not found any very massive stars that exploded, suggesting that the most massive stars may collapse to form black holes either without producing a supernova or by producing one that is too faint to observe. This intriguing possibility will be discussed at the meeting.
[color=blue]在2008年贝尔法斯特召开的英国国家天文学会议上他们提交了最近的工作成果，小组展示了他们对这些难以捉摸的超新星前体星十年的研究成果。似乎恒星质量低至7倍太阳质量可以爆发成超新星。该小组没有发现任何有非常大质量的恒星爆发，暗示最重量级的恒星可能坍缩形成黑洞而不产生超新星或者产生的超星星过于黯淡无法观测到。这一有趣的可能性将在会议期间讨论。[/color]
The images were obtained on 14 October 2006 with [color=blue]Hubble's[/color] Advanced Camera for Surveys (ACS) with three different colour filters (blue, green and near-infrared).
[color=blue]该图片由“哈勃”高级巡天相机使用三个不同滤镜（蓝、绿和近红外）于2006年10月14日拍摄。[/color]
PS：无损的两幅地址
[url=http://esamultimedia.esa.int/images/hubble/heic0808b_H2.tif]http://esamultimedia.esa.int/images/hubble/heic0808b_H2.tif[/url]
[url=http://esamultimedia.esa.int/images/hubble/heic0808a_H2.tif]http://esamultimedia.esa.int/images/hubble/heic0808a_H2.tif[/url]
[[i] 本帖最后由 Eldghost 于 2008-4-3 23:03 编辑 [/i]] 如果你早来半个星期我还能给你编辑、标记。。。
[[i] 本帖最后由 活动星图 于 2008-4-2 13:37 编辑 [/i]] 学习了，好东西啊！::0020:: 图蛮大的!漂亮!!::42:: ::42:: ::42:: [quote]原帖由 [i]活动星图[/i] 于 2008-4-2 13:36 发表 [url=http://www.astronomy.com.cn/bbs/redirect.php?goto=findpost&pid=921424&ptid=89256][img]http://www.astronomy.com.cn/bbs/images/common/back.gif[/img][/url]
如果你早来半个星期我还能给你编辑、标记。。。 [/quote]
我来，呵呵 楼主好久不见！精华！ 呵呵，这段时间上不了mf，少发了不少图。。。 很好,很好.如果发生在大麦或者小麦中,将会看得更为确定一些.
可惜,1987A以后,就再没有如此机会.而1987年,哈伯还没有上轨道.
爆发前是不是红巨星? 电脑抽风，看不全图，555555555 ::yun2:: ::pill::
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