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type I supernova

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type I supernova [′tīp ¦wən ¦sü·pər′nō·və]
(astronomy)
A member of a class of supernovae that lack hydrogen in their spectra and have relatively regular light curves.


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But nearly all have relied on X-ray emissions from iron, which can enter the intracluster medium in two ways--the explosion of many massive stars as type II supernovas or the detonation of far fewer, lower-mass stars as type I supernovas.
The hydrogen emission had been replaced by helium, a characteristic of a type I supernova known as Ib.
As a result, Type I supernovas -- which suffuse the interstellar medium with iron-rich gas -- dictated the chemical composition of new stars, the researchers report.
 
 
 
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