Extreme enhancements of r-process elements in the cool metal-poor main-sequence star SDSS J2357-0052
We report the discovery of a cool metal-poor, main-sequence star exhibiting large excesses of r-process elements. This star is one of the two newly discovered cool subdwarfs (effective temperatures of 5000 K) with extremely low metallicity ([Fe/H] < -3) identified from follow-up high-resolution spectroscopy of metal-poor candidates from the Sloan Digital Sky Survey. SDSS J2357-0052 has [Fe/H]= -3.4 and [Eu/Fe]= +1.9, and exhibits a scaled solar r-process abundance pattern of heavy...[Show more]
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|Source:||Astrophysical Journal, The|
|01_Aoki_Extreme_enhancements_of_2010.pdf||275.51 kB||Adobe PDF||Request a copy|
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