Michigan astronomers discover promethium in star
Article first published online: 12 APR 2012
©1971. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 52, Issue 1, page 10, January 1971
How to Cite
1971), Michigan astronomers discover promethium in star, Eos Trans. AGU, 52(1), 10–10, doi:10.1029/EO052i001p00010-01.(
- Issue published online: 12 APR 2012
- Article first published online: 12 APR 2012
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A rare element that does not exist naturally on earth has been identified in the spectrum of a star by two University of Michigan astronomers.
Working under a National Science Foundation grant, Margo Friedel Aller and Charles Cowley have identified promethium in an unusual star known as HR 465. Promethium is a short-lived rare earth that previously has been known only as a synthetic element. Although its existence had been predicted as early as 1902, it was not discovered until 1947, among the fission products of uranium.