High-resolution spectra of two stars: HD 122563 (blue) and HE 1523−0901 (red). While the former star has low abundances of r-process elements, the latter is the richest object in these elements ever found in the Galaxy’s halo. It is important to note that the spectrum of HE 1523−0901 shows a large number of strong absorption lines from lanthanides such as lanthanum (La), cerium (Ce), samarium (Sm) and europium (Eu), which produces the most intense absorption line at 4129.70 Å. (Reproduced from Frebel & Beers 2018, with the permission of the American Institute of Physics).
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