What's in a star? Well, if you're a highly evolved specimen nearing the end of its life named HD 222925, rather a heck of a lot, actually.
, via a mechanism called the rapid neutron-capture process, this star's composition could be a means to learn more about how heavy elements form.
"You need lots of neutrons that are free and a very high energy set of conditions to liberate them and add them to the nuclei of atoms,"This brings us back to HD 222925, located around 1,460 light-years away, which is certainly a bit of an oddball. It's past the red giant stage of its lifetime, having run out of hydrogen to fuse, and is now fusing helium in its core.
Certain elements can either enhance or dim specific wavelengths of light, as the atoms absorb and re-emit photons. Those emission and absorption features in the spectrum can then be analyzed and traced back to the elements that produced them, and identify their abundances. Of the 65 elements the team identified in this manner, 42 – nearly two thirds – were r-process elements.
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