Going Nova: Star Explosions Unleash Gamma-Ray Blasts
The star V407 Cyg explodes in a nova while circling a neighboring red giant star in this still from a NASA animation depicting the star explosion detected in 2010.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Aug 4, 2014
Interesting: I missed this one on the Astronomy forum so handy to have a second bite.
The article features gamma rays originating from classical novae with a difficulty in mechanism where no dense dusty disc was present to provide a shell smash up & shreddies element production.
The gamma rays originating from novae may have a very classical origin. A nova eruption is a result of a thermonuclear shell flash on a WD. The fusion generates gamma rays as a byproduct of the H fusion in the shell & the lifting of the outer layers into a nova layers is due to random walk processes in the gamma ray released by the fusion which bounces around from nucleus to nucleus dropping energy & bouncing the nucleus it hits.
In a thin shell there are not a lot of nuclei and as a result as the shell lifts some direct fusion gamma rays will escape relatively unmodified, particularly toward the end of the shell flash. Once you see the gamma rays the shell flash creating the nova is effectively over, but the expanding shell still continues to expand making the nova flash easier to see,(the gamma ray flash is the "ka" immediately preceeding the "boom" caused by the expansion of the shell.
A bit like the films of the early aerial atom bomb tests which is a relatively similar mechanism in full colour intimate close up; (oops still thinking of gecko satellites...)
Have a nice day: Ag
#2 Aug 8, 2014
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