美国国家航空航天局NASA每日一图(天文)-2017年6月29日

2017 June 29

Symbiotic R Aquarii  Image Credit: X-ray - NASA,CXC,SAO, R. Montez et al.; Optical - Adam Block, Mt. Lemmon SkyCenter, U. Arizona

Explanation: A long recognized naked-eye variable star, R Aquarii is actually an interacting binary star system, two stars that seem to have a close, symbiotic relationship. About 710 light years away, it consists of a cool red giant star and hot, dense white dwarf star in mutual orbit around their common center of mass. The binary system's visible light is dominated by the red giant, itself a Mira-type long period variable star. But material in cool giant star's extended envelope is pulled by gravity onto the surface of the smaller, denser white dwarf, eventually triggering a thermonuclear explosion and blasting material into space. Optical image data (red) shows the still expanding ring of debris originating from a blast that would have been seen in the early 1770s. The evolution of less understood energetic events producing high energy emission in the R Aquarii system has been monitored since 2000 using Chandra X-ray Observatory data (blue). The composite field of view is less that a light-year across at the estimated distance of R Aquarii.

2017年6月29日

共生R Aquarii图像信用:X射线-美国宇航局,CXC,SAO,R.Montez等.al,太。莱蒙skycenter,美国亚利桑那州的

解释:长期公认的肉眼变星,宝瓶座R爆发的实际上是一个相互作用的双星系统,两颗星似乎已经接近尾声,共生关系。大约710光年远,它由一颗很酷的红巨星和炽热的白矮星组成,在它们的共同质量中心相互轨道上。二元系统的可见光由红巨星主导,本身是一个米拉的长周期变星。但材料在巨星的扩展包,是由重力较小的表面,致密的白矮星,最终引发了热核爆炸和爆破材料送入太空。光学图像数据(红色)显示了在1770s早期出现的爆炸中仍有膨胀的碎片环。自2000年以来,利用钱德拉X射线观测数据(蓝色)从2000年开始对充满活力系统产生高能量发射的能量事件进行了较少的研究。在Aquarii的估计距离上,复合视场的.要小得多。

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