Browsing Research publications by Author "Ryan, Sean G."
Now showing items 21-40 of 65
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Europium Isotope Ratios in s-Process Element-enhanced Metal-poor Stars : A New probe of the 151Sm Branching
Aoki, W.; Ryan, Sean G.; Iwamoto, N.; Beers, T.C.; Norris, J.E.; Ando, H.; Kajino, T.; Mathews, G.J.; Fujimoto, M.Y. (2003-08) -
Experimental Mg I oscillator strengths and radiative lifetimes for astrophysical applications on metal-poor stars : New data for the Mg I b triplet
Aldenius, M.; Tanner, J.D.; Johansson, S.; Lundberg, H.; Ryan, Sean G. (2007) -
Extremely Metal-poor Stars : IX CS 22949-037 and the Role of Hypernovae
Norris, J.E.; Ryan, Sean G.; Beers, T.C.; Ando, H.; Aoki, W. (2002-04) -
Extremely Metal-Poor Stars. VIII. High-Resolution, HighSignal-to-Noise Ratio Analysis of Five Stars with [Fe/H][[3.5
Norris, J.E.; Ryan, Sean G.; Beers, T.C. (2001-11) -
The first detection of cobalt in a damped Lyman alpha system
Ellison, S.L.; Ryan, Sean G.; Prochaska, J.X. (2001-09) -
The Halo Lithium Plateau : Outstanding Issues
Ryan, Sean G.; Elliott, L. (Springer Nature, 2006)We examine outstanding issues in the analysis and interpretation of the halo Li plateau. We show that the majority of very Li-poor halo Li-plateau stars (5 out of 8) have high projected rotation velocities vsini between ... -
The Halo Lithium Plateau: Outstanding Issues
Ryan, Sean G.; Elliott, L. (2006) -
The Hamburg/ESO R-process Enhanced Star survey (HERES). I : Project description and discovery of two stars with strong enhancements of neutron-capture elements
Christlieb, N.; Beers, T.C.; Barklem, P.S.; Bessell, M.S.; Hill, V.; Holmberg, J.; Korn, A.J.; Marsteller, B.; Mashonkina, L.; Qian, Y.Z.; Rossi, S.; Wasserburg, G.J.; Zickgraf, F.J.; Kratz, K.L.; Nordstrom, B.; Pfeiffer, B.; Rhee, J.; Ryan, Sean G. (2004-12) -
A high-resolution spectral analysis of three carbon-enhanced metal-poor stars
Goswami, A.; Aoki, W.; Beers, T.C.; Christlieb, N.; Norris, J.E.; Ryan, Sean G.; Tsangarides, S. (2006) -
The host stars of extrasolar planets have normal lithium abundances
Ryan, Sean G. (2000)The lithium abundances of planet-harbouring stars have been compared with those of open clusters and field stars. Young (chromospherically active) and subgiant stars have been eliminated from the comparison because they ... -
Imaging of X-Ray-Excited Emissions from Quantum Dots and Biological Tissue in Whole Mouse
Ryan, Sean G.; Butler, Matthew N.; Adeyemi, Segun; Kalber, Tammy; Patrick, Peter Stephen; Thin, May Zaw; Harrison, Ian F.; Stuckey, Daniel J.; Pule, Martin; Lythgoe, Mark (2019-12-16)Optical imaging in clinical and preclinical settings can provide a wealth of biological information, particularly when coupled with targetted nanoparticles, but optical scattering and absorption limit the depth and resolution ... -
Intermediate-metallicity, high-velocity stars and Galactic chemical evolution
Ryan, Sean G.; Smith, I.M. (2003-05) -
Late stages of stellar evolution
Ryan, Sean G. (2004-10) -
Lead and s-process elements in stars of various metallicities : AGB predictions and observations
Delaude, D.; Gallino, R.; Christallo, S.; Straniero, O.; Husti, L.; Ryan, Sean G. (2004) -
Limits on Reddening and Gas-to-Dust Ratios for Seven Intermediate Redshift Damped Ly-alpha Absorbers from Diffuse Interstellar Bands
Lawton, B.; Churchill, C.W.; York, B.A.; Ellison, S.L.; Snow, T.P.; Johnson, R.; Ryan, Sean G.; Benn, C. (2008) -
Lithium 6104 A in Population II stars
Ford, A.; Jeffries, R.D.; Smalley, B.; Ryan, Sean G.; Aoki, W.; Kawanomoto, S.; James, D.J.; Barnes, John R. (2002-10) -
Lithium abundances in halo dwarfs
Ryan, Sean G. (2005) -
Lithium abundances of halo dwarfs based on excitation temperature I : Local thermodynamic equilibrium
Hosford, A.; Ryan, Sean G.; Garcia Perez, A.E.; Norris, J.E.; Olive, K.A. (2009-01) -
Lithium abundances of halo dwarfs based on excitation temperatures. II : Non-local thermodynamic equilibrium
Hosford, A.; Perez, A.E.G.; Collet, R.; Ryan, Sean G.; Norris, J.E.; Olive, K.A. (2010)Context. The plateau in the abundance of 7Li in metal-poor stars was initially interpreted as an observational indicator of the primordial lithium abundance. However, this observational value is in disagreement with that ... -
Lithium isotopic abundances in old stars
Perez, Ana Elia Garcia; Inoue, Susumu; Aoki, Wako; Ryan, Sean G. (2008)Lithium is an element of great importance from a cosmological point of view. Observations of its light isotope Li-6 are very delicate and in the literature, detections for only a handful of metal-poor stars are found. High ...