Astronomers Discover “Gold Standard” Star in Milky Way
Astronomers have uncovered a star, called HD 222925, that has the widest range of elements yet observed in a star beyond our own Sun. They have identified 65 elements in the star, including 42 from the bottom of the periodic table.
A team of astronomers led by University of Michigan’s Ian Roederer and including Carnegie’s Erika Holmbeck have identified the widest range of elements yet observed in a star beyond our own Sun. Their findings will be published in The Astrophysical Journal Supplement Series.
The researchers identified 65 elements in the star, which is called HD 222925. Of these, 42 are from the bottom of the periodic table. Their identification will help astronomers better understand rapid neutron capture process — one of the main methods by which the universe’s heavy elements were created.
“To the best of my knowledge, that’s a record for any object beyond our Solar System. And what makes this star so unique is that it has a very high relative proportion of the elements listed along the bottom two-thirds of the periodic table. We even detected gold,” explained Roederer, a former Carnegie postdoc. “These elements were made by the rapid neutron capture process. That’s really the thing we’re trying to study: the physics in understanding how, where and when those elements were made.”
The star HD 222925 is a ninth-magnitude star located toward the southern constellation Tucana. Credit: The STScI Digitized Sky Survey
Many elements are formed by nuclear fusion, in which two atomic nuclei fuse together and release energy, creating a different, heavier arXiv:2205.03426
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