Friday, September 9, 2011

APOD 1.2 A Star That Should Not Exist







"SDSS J102915+172927: A Star That Should Not Exist" A star that shouldn't exist because the literal elements which this star is composed from should not be able to be combined in this way. Especially because it is expected to have, at minimum, fifty times more lithium than it does. What i want to know is how a star like this would form without such levels of lithium when the environment does not provide those conditions. It has less than .00007% lithium, the heavy metal that is supposed to far outweigh the amounts of He and H. It's curious that with just one discovery like this, and when nobody was even looking for it in particular, can shake the most basic of assumptions about how and from what these stars are formed. One hypothesis is saying that the lithium may have been destroyed due to the temperatures in the star's center but if that's true then it doesn't make sense why more stars, hotter stars, don't have this same composition ratio. Also, with no elements heavier than He and H it's interesting to see how the star keeps itself together. Would it have to avoid the heavier elements while orbiting the galaxy and if so, how?

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