Author

Number of items: 69.
Article
  • A Critique of the Spite Plateau, and the Astration of Primordial Lithium. (2023) J.E. Norris, David Yong, Anna Frebel and Sean Ryan
  • Multi-fluorescence high-resolution episcopic microscopy (MF-HREM) for three dimensional imaging of adult murine organs. (2021) Claire Walsh, Natalie Holroyd, Eoin Finnerty, Sean Ryan, Paul Sweeney, Rebecca Shipley and Simon Walker-Samuel
  • Theranostic Near-Infrared-Active Conjugated Polymer Nanoparticles. (2021) Miao Zhao, Edward Leggett, Struan Bourke, Souzana Poursanidou, Sadie Carter-Searjeant, Steve Po, Marciano Palma do Carmo, Lea Ann Dailey, Philip Manning, Sean Ryan, Laura Urbano, Mark Green and Aliaksandra Rakovich
  • Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys. (2021) Guilherme Limberg, Silvia Rossi, Timothy Beers, Helio Perottoni, Angeles Perez-Villegas, Rafael Santucci, Yuri Abuchaim, Vinicius Placco, Young Sun Lee, Norbert Christlieb, John Norris, Michael Bessell, Sean Ryan, Ronald Wilhelm, Jaehyon Rhee and Anna Frebel
  • Imaging of X-Ray-Excited Emissions from Quantum Dots and Biological Tissue in Whole Mouse. (2019) Sean G. Ryan, Matthew N. Butler, Segun Adeyemi, Tammy Kalber, Peter Stephen Patrick, May Zaw Thin, Ian F. Harrison, Daniel J. Stuckey, Martin Pule and Mark Lythgoe folder_zip
  • The Rotation of the halo of NGC 6822 from the radial velocities of carbon stars. (2016) Graham Thompson, Sean Ryan and Lisette Sibbons
  • A three-dimensional hydrodynamical line profile analysis of iron lines and barium isotopes in HD140283. (2015) A. J. Gallagher, H. G. Ludwig, Sean G. Ryan and W. Aoki
  • Spectral classification of photometrically selected AGB candidates in NGC 6822. (2015) L. F. Sibbons, Sean G. Ryan, Ralf Napiwotzki and G. P. Thompson
  • The AGB population in IC 1613 using JHK photometry. (2015) L. F. Sibbons, Sean G. Ryan, M. Irwin and R. Napiwotzki
  • The Most Metal-Poor Stars. IV : The Two Populations with [Fe/H] <~ -3.0. (2013) John Norris, David Yong, Michael Bessell, Norbert Christlieb, Martin Asplund, G.F. Gilmore, Rosemary F. G. Wyse, Timothy Beers, Paul Barklem, Anna Frebel and Sean G. Ryan
  • The Most Metal-poor Stars. I : Discovery, Data and Atmospheric Parameters. (2013) John Norris, Michael Bessell, David Yong, Norbert Christlieb, Paul Barklem, Martin Asplund, Michael Murphy, Timothy Beers, Anna Frebel and Sean G. Ryan
  • The Most Metal-poor Stars. II : Chemical Abundances of 190 Metal-poor Stars Including 10 New Stars with [Fe/H] <= -3.5. (2013) David Yong, John Norris, Michael S. Bessell, Martin Asplund, Timothy C. Beers, Paul S. Barklem, Anna Frebel and Sean G. Ryan
  • The Most Metal-poor Stars. III : The Metallicity Distribution Function and Carbon-enhanced Metal-poor Fraction. (2013) David Yong, John Norris, Michael Bessell, Norbert Christlieb, Martin Asplund, Timothy Beers, Paul Barklem, Anna Frebel and Sean G. Ryan
  • The AGB population of NGC 6822 : Distribution and the C/M ratio from JHK photometry. (2012) L. F. Sibbons, Sean G. Ryan, M-R.L. Cioni, M. Irwin and R. Napiwotzki
  • The barium isotopic fractions in five metal-poor stars. (2012) Andrew Gallagher, Sean G. Ryan, Adam Hosford, A E Garcia Perez, W Aoki and S Honda
  • Lithium abundances of halo dwarfs based on excitation temperatures. II : Non-local thermodynamic equilibrium. (2010) A. Hosford, A.E.G. Perez, R. Collet, Sean G. Ryan, J.E. Norris and K.A. Olive
  • The barium isotopic mixture for the metal-poor subgiant star HD 140283. (2010) A.J. Gallagher, Sean G. Ryan, A.E. Garcia Perez and W. Aoki picture_as_pdf
  • 6Li/7Li estimates for metal-poor stars. (2009) A.E. Garcia Perez, W. Aoki, S. Inoue, Sean G. Ryan, T.K. Suzuki and M. Chiba picture_as_pdf
  • Lithium abundances of halo dwarfs based on excitation temperature I : Local thermodynamic equilibrium. (2009) A. Hosford, Sean G. Ryan, A.E. Garcia Perez, J.E. Norris and K.A. Olive picture_as_pdf
  • Carbon-Enhanced Metal-Poor Stars. III : Main-Sequence Turn-Off Stars from the SDSS/SEGUE Sample. (2008) W. Aoki, T.C. Beers, T. Sivarani, B. Marsteller, Y.S. Lee, S. Honda, J.E. Norris, Sean G. Ryan and D. Carollo picture_as_pdf
  • Experimental Mg I oscillator strengths and radiative lifetimes for astrophysical applications on metal-poor stars : New data for the Mg I b triplet. (2007) M. Aldenius, J.D. Tanner, S. Johansson, H. Lundberg and Sean G. Ryan
  • Carbon-enhanced metal-poor stars. Osmium and iridium abundances in the neutron-capture-enhanced subgiants CS31062-050 and LP625-44. (2006) W. Aoki, S. Bisterzo, R. Gallino, T.C. Beers, J.E. Norris, Sean G. Ryan and S. Tsangarides
  • A high-resolution spectral analysis of three carbon-enhanced metal-poor stars. (2006) A. Goswami, W. Aoki, T.C. Beers, N. Christlieb, J.E. Norris, Sean G. Ryan and S. Tsangarides
  • Nucleosynthetic signatures of the first stars. (2005) A. Frebel, W. Aoki, N. Christlieb, H. Ando, M. Asplund, P.S. Barklem, T.C. Beers, K. Eriksson, C. Fechner, M.Y. Fujimoto, S. Honda, T. Kajino, T. Minezaki, K. Nomoto, J.E. Norris, Sean G. Ryan, M. Takada-Hidai, S. Tsangarides and Y. Yoshii
  • Mg abundances in metal-poor halo stars as a tracer of early Galactic mixing. (2005) E. Arnone, Sean G. Ryan, D. Argast, J.E. Norris and T.C. Beers
  • The Binary Frequency Among Carbon-enhanced, s-Process-rich, Metal-poor Stars. (2005) S. Lucatello, S. Tsangarides, T.C. Beers, E. Carretta, R.G. Gratton and Sean G. Ryan
  • Lithium abundances in halo dwarfs. (2005) Sean G. Ryan
  • The new record holder for the most iron-poor star: HE 1327−2326, a dwarf or subgiant with [Fe/H] = −5.4. (2005) A. Frebel, W. Aoki, N. Christlieb, H. Ando, M. Asplund, P.S. Barklem, T.C. Beers, K. Eriksson, C. Fechner, M.Y. Fujimoto, S. Honda, T. Kajino, T. Minezaki, K. Nomoto, J.E. Norris, Sean G. Ryan, M. Takada-Hidai, S. Tsangarides and Y. Yoshii
  • The Hamburg/ESO R-process Enhanced Star survey (HERES). I : Project description and discovery of two stars with strong enhancements of neutron-capture elements. (2004) N. Christlieb, T.C. Beers, P.S. Barklem, M.S. Bessell, V. Hill, J. Holmberg, A.J. Korn, B. Marsteller, L. Mashonkina, Y.Z. Qian, S. Rossi, G.J. Wasserburg, F.J. Zickgraf, K.L. Kratz, B. Nordstrom, B. Pfeiffer, J. Rhee and Sean G. Ryan
  • A low upper-limit on the lithium isotope ratio in HD140283. (2004) W. Aoki, S. Inoue, S. Kawanomoto, Sean G. Ryan, I.M. Smith, T.K. Suzuki and M. Takada-Hidai
  • Late stages of stellar evolution. (2004) Sean G. Ryan
  • Oxygen Overabundance in the Extremely Iron-poor Star CS 29498-043. (2004) W. Aoki, J.E. Norris, Sean G. Ryan, T.C. Beers, N. Christlieb, S. Tsangarides and H. Ando
  • Spectroscopic Studies of Extremely Metal-Poor Stars with the Subaru High Dispersion Spectrograph. I. Observational Data. (2004) S. Honda, W. Aoki, H. Ando, H. Izumiura, T. Kajino, E. Kambe, S. Kawanomoto, K. Noguchi, K. Okita, K. Sadakane, B. Sato, M. Takada-Hidai, Y. Takeda, E. Watanabe, T.C. Beers, J.E. Norris and Sean G. Ryan
  • The Detection of Low Eu Abundances in Extremely Metal-poor Stars and the Origin of r-Process Elements. (2004) Y. Ishimaru, S. Wanajo, W. Aoki and Sean G. Ryan
  • Lead and s-process elements in stars of various metallicities : AGB predictions and observations. (2004) D. Delaude, R. Gallino, S. Christallo, O. Straniero, L. Husti and Sean G. Ryan
  • On the binarity of carbon-enhanced, metal-poor stars. (2004) S. Tsangarides, Sean G. Ryan and T.C. Beers
  • Europium Isotope Ratios in s-Process Element-enhanced Metal-poor Stars : A New probe of the 151Sm Branching. (2003) W. Aoki, Sean G. Ryan, N. Iwamoto, T.C. Beers, J.E. Norris, H. Ando, T. Kajino, G.J. Mathews and M.Y. Fujimoto
  • Intermediate-metallicity, high-velocity stars and Galactic chemical evolution. (2003) Sean G. Ryan and I.M. Smith
  • Observations of r- and s-process elements in population II stars. (2003) Sean G. Ryan
  • A Subaru/High Dispersion Spectrograph Study of Lead (Pb) Abundances in Eight s-Process Element-rich, Metal-poor Stars. (2002) W. Aoki, Sean G. Ryan, J.E. Norris, T.C. Beers, H. Ando and S. Tsangarides
  • Lithium 6104 A in Population II stars. (2002) A. Ford, R.D. Jeffries, B. Smalley, Sean G. Ryan, W. Aoki, S. Kawanomoto, D.J. James and John R. Barnes
  • Chemical Composition fo the Carbon-rich, Extremely Metal Poor Star CS 29498-043. (2002) W. Aoki, J.E. Norris, Sean G. Ryan, T.C. Beers and H. Ando
  • Rapid Rotation of Ultra-Li-depleted Halo Stars and Their Association with Blue Stragglers. (2002) Sean G. Ryan, S. Gregory, U. Kolb, T.C. Beers and T. Kajino
  • Extremely Metal-poor Stars : IX CS 22949-037 and the Role of Hypernovae. (2002) J.E. Norris, Sean G. Ryan, T.C. Beers, H. Ando and W. Aoki
  • The Chemical Composition of Carbon-rich, very Metal Poor Stars : A New Class of Mildly Carbon Rich Objects without Excess of Neutron-Capture Elements. (2002) W. Aoki, J.E. Norris, Sean G. Ryan, T.C. Beers and H. Ando
  • Big Bang Nucleosynthesis, Population III, and Stellar Genetics in the Galactic Halo. (2002) Sean G. Ryan
  • Extremely Metal-Poor Stars. VIII. High-Resolution, HighSignal-to-Noise Ratio Analysis of Five Stars with [Fe/H][[3.5. (2001) J.E. Norris, Sean G. Ryan and T.C. Beers
  • Neutron Capture Elements in s-Process-Rich, Very Metal-Poor Stars. (2001) W. Aoki, Sean G. Ryan, J.E. Norris, T.C. Beers, H. Ando, N. Iwamoto, T. Kajino, G.J. Mathews and M.Y. Fujimoto
  • The first detection of cobalt in a damped Lyman alpha system. (2001) S.L. Ellison, Sean G. Ryan and J.X. Prochaska
  • Abundances and Evolution of Lithium in the Galactic Halo and Disk. (2001) Sean G. Ryan, T. Kajino, T.C. Beers, T.K. Suzuki, D. Romano, F. Matteucci and K. Rosolankova
  • Ultra-Lithium-deficient Halo Stars and Blue Stragglers : A Common Origin? (2001) Sean G. Ryan, T.C. Beers, T. Kajino and K. Rosolankova
  • s- and r-process elements in two very metal-poor stars. (2001) Sean G. Ryan, W. Aoki, L.A.J. Blake, J.E. Norris, T.C. Beers, R. Gallino, M. Busso and H. Ando
  • Primordial Lithium and Big Bang Nucleosynthesis. (2000) Sean G. Ryan, T.C. Beers, K.A. Olive, B.D. Fields and J.E. Norris
  • The host stars of extrasolar planets have normal lithium abundances. (2000) Sean G. Ryan
  • The Spite Lithium Plateau: Ultrathin but Postprimordial. (1999) Sean G. Ryan, J.E. Norris and T.C. Beers
  • Boron in the very metal-poor star BD-13 3442. (1998) D.K. Duncan, L.M. Rebull, F. Primas, A.M. Boesgaard, C.P. Deliyannis, L.M. Hobbs, J.R. King and Sean G. Ryan
  • The SALT HRS spectrograph : final design, instrument capabilities, and operational modes. (2010) D.G. Bramall, R. Sharples, L. Tyas, J. Schmoll, P. Clark, P. Luke, N. Looker, N.A. Dipper and Sean G. Ryan
  • Estimation of Stellar Metal Abundance. II : A Recalibration of the Ca II K Technique, and the Autocorrelation Function Method. (1999) T.C. Beers, S. Rossi, J.E. Norris, Sean G. Ryan and T. Shefler
  • Limits on Reddening and Gas-to-Dust Ratios for Seven Intermediate Redshift Damped Ly-alpha Absorbers from Diffuse Interstellar Bands. (2008) B. Lawton, C.W. Churchill, B.A. York, S.L. Ellison, T.P. Snow, R. Johnson, Sean G. Ryan and C. Benn
  • Spectroscopic studies of extremely metal-poor stars with the Subaru high dispersion spectrograph. IV : The alpha-element-enhanced metal-poor star BS16934-002. (2007) W. Aoki, S. Honda, T.C. Beers, M. Takada-Hidai, N. Iwamoto, N. Tominaga, H. Umeda, K. Nomoto, J.E. Norris and Sean G. Ryan
  • Carbon enhanced metal-poor stars I : Chemical compositions of 26 stars. (2007) W. Aoki, T.C. Beers, N. Christlieb, J.E. Norris, Sean G. Ryan and S. Tsangarides
  • Beryllium Abundances in Halo Stars from Keck/HIRES Observations. (1999) A.M. Boesgaard, C.P. Deliyannis, J.R. King, Sean G. Ryan, S. Vogt and T.C. Beers
  • Nucleosynthesis and early chemical evolution in galaxies. (2003) S. Tsangarides, E. Arnone and Sean G. Ryan
  • A new sample of extremely/ultra metal-poor stars. (2008) A. E. Garcia Perez, N. Christlieb, Sean G. Ryan, T.C. Beers, W. Aoki, M. Asplund, P.S. Barklem, M.S. Bessell, K. Eriksson, A. Frebel, B. Gustafsson, A.J. Korn, B. Nordstrom and J.E. Norris
  • Lithium isotopic abundances in old stars. (2008) Ana Elia Garcia Perez, Susumu Inoue, Wako Aoki and Sean G. Ryan
    • Conference or Workshop Item
  • The Halo Lithium Plateau : Outstanding Issues. (2006) Sean G. Ryan and L. Elliott
  • Abundances and Kinematics of Extremely Metal-Deficient, Carbon-Rich Halo Stars. (2003) S. Tsangarides, Sean G. Ryan and T.C. Beers
  • Carbon-rich, Extremely Metal-Poor Population II stars. (2003) Sean G. Ryan
  • Abundances in very metal-poor stars. (2000) Sean G. Ryan
    • This list was generated on Tue Oct 20 02:45:18 2026 BST.