Browsing Research publications by Author "Ryan, Sean G."
Now showing items 61-65 of 65
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Spectroscopic studies of extremely metal-poor stars with the Subaru high dispersion spectrograph. IV : The alpha-element-enhanced metal-poor star BS16934-002
Aoki, W.; Honda, S.; Beers, T.C.; Takada-Hidai, M.; Iwamoto, N.; Tominaga, N.; Umeda, H.; Nomoto, K.; Norris, J.E.; Ryan, Sean G. (2007) -
The Spite Lithium Plateau: Ultrathin but Postprimordial
Ryan, Sean G.; Norris, J.E.; Beers, T.C. (1999)We have studied 23 very metal-poor field turnoff stars, specifically chosen to enable a precise measurement of the dispersion in the lithium abundance of the Spite Li plateau. -
A Subaru/High Dispersion Spectrograph Study of Lead (Pb) Abundances in Eight s-Process Element-rich, Metal-poor Stars
Aoki, W.; Ryan, Sean G.; Norris, J.E.; Beers, T.C.; Ando, H.; Tsangarides, S. (2002-12) -
A three-dimensional hydrodynamical line profile analysis of iron lines and barium isotopes in HD140283
Gallagher, A. J.; Ludwig, H. G.; Ryan, Sean G.; Aoki, W. (2015-07-31)Heavy-elements, i.e. those beyond the iron peak, mostly form via two neutron capture processes: the s- and r-process. Metal-poor stars should contain fewer isotopes that form via the s-process, according to currently ... -
Ultra-Lithium-deficient Halo Stars and Blue Stragglers : A Common Origin?
Ryan, Sean G.; Beers, T.C.; Kajino, T.; Rosolankova, K. (2001-01)