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Probing New Stellar Explosion (Image 7)


From an image sequence showing expanding blast wave from the star Eta Carinae's 1843 eruption

This image is part of a sequence showing an artist's conception of the expanding blast wave from the star Eta Carinae's 1843 eruption, an explosive, huge outburst that created the well-known, two-lobed Homunculus Nebula (a slow-moving shell of gas and dust) and the fast shock wave that propagates ahead of it. In this sequence of images, as time passes, we see both the faster shock wave and the denser Homunculus expand and fill the interior of the old shell. Eventually, the faster blast wave begins to catch up with, and overtake parts of, the older shell, producing a bright fireworks display that heats the older shell (the collision of the two generates X-rays [orange], which have been observed by an orbiting observatory).

Scientists have long wondered what caused Eta Carinae's outburst ever since the star was observed brightening immensely in 1843. But astronomers using the Gemini South and Blanco Telescopes in Chile have observed faint but extremely fast material indicative of a powerful shock wave having been produced by the event and suggesting that the cause was an actual explosion deep in the star, rather than a surface eruption caused by the stellar wind. The research--led by Nathan Smith of the University of California, Berkeley, and supported in part by the National Science Foundation and NASA--shows that the famous nebulosity around the star contains extremely fast-moving filaments of material not observed before and that cannot be explained by current theories.

Further information about this discovery is available in the UC-Berkeley news release "1843 Stellar Eruption New Type of Star Explosion." (Date of Image: 2008) [Image 7, final in a sequence. Back to Image 1.]

Credit: Gemini Observatory artwork by Lynette Cook
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