> Astronomers have a white dwarf found a composition that has never been seen before.
If our sun is a few billion years ‘burnt out’, he is a white dwarf:. a remnant the size of the earth, that is half as heavy as the current sun of this type “star” there are now tens of thousands of known but does not appear it on the copy which three astronomers have now been published in . Science .
the exterior or atmosphere of the white dwarf in question, which has been given the nickname Dox, which comprises 99.9 percent oxygen. which is strange, because having white dwarfs usually the structure of an onion: went into the center are the heavy elements carbon and oxygen around it is a layer of helium, and the outside is a shell of almost pure hydrogen Possibly Dox, when he went from star to a white dwarf. are helium and hydrogen were lost in some rare process.
it is also odd that the outside of Dox (alongside so many oxygen) containing a small amount of the heavier element silicon. Normally, in which stars end up as white dwarfs anything available that is heavier than oxygen; the temperature and pressure in the center are not high enough to produce nuclear fusion through elements such as silicon. Apparently that Dox at the time that he had succeeded indeed an ordinary star. But then he according to current theories he must have been at that time so hard not white dwarf was over, but as an even more compact neutron star.
In short, a star that astronomers once well have put on thinking, which Dox
Sources:. Science (1) Science (2), Wired
image: ESO
In this item are (still) no responses.
No comments:
Post a Comment