type II supernova


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type II supernova

[′tīp ¦tü ¦sü·pər′nō·və]
(astronomy)
A member of a class of supernovae that display prominent lines of hydrogen in their spectra and have irregular light curves; they are believed be explosions of young massive stars, still in possession of their hydrogenic surface layers.
References in periodicals archive ?
At the tender age of 9 million years, it has already started shutting down hydrogen fusion in its core, and sometime in the next million years it will blow itself apart in a Type II supernova. Omicron Persei A is also a S1 giant, somewhat smaller than Zeta, but likewise fated to go out in a blaze of glory.
SN1987A was indeed fainter than a normal type II supernova. The total energy released depends on the mass of the star, while the optical manifestation, which only accounts for about 0.01 per cent of the total energy, depends on the radius of the star.
SN 2005ap is classified as a type II supernova, marking the collapse of a massive star.
(http://earthsky.org/astronomy-essentials/supernove-distance) EarthSky  says there aren't any old, massive stars close enough to explode in a Type II supernova, which happens when those huge stars collapse.
This type II supernova has been given the interim designation J012634+3137036.
These isotopes could have come from a Type II supernova, caused by the core-collapse of a massive star.
SN 2013df is classified as a (http://cse.ssl.berkeley.edu/bmendez/ay10/2000/cycle/snII.html) Type II supernova .
They conclude that the quantity of iron-60--especially in the 4- to 6-million-year-old middle layer--indicates a massive stellar explosion, probably a type II supernova, about 5 million years ago.
During a Type II supernova, the death of a massive but otherwise normal star, atoms are relentlessly bombarded with neutrons--more than a hundred billion trillion per cubic centimeter.
With a conservatively estimated peak luminosity of 50 billion Suns (absolute magnitude -22), Supernova 2006gy radiated about 100 times more energy than a typical Type II supernova, which represents the death of a massive star.
If the star did explode as a normal type II supernova, why then did it take up to four times as long to brighten and diminish as other such supernova and why did emit up to 100 times more X-rays energy than expected?

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