Results 1 - 10 of 1,541

Detection of Lead in the Carbon-rich, Very Metal-poor Star LP 625-44: A Strong Constraint on S-Process Nucleosynthesis at Low Metallicity,” Astrophys

by Wako Aoki, John E. Norris, Sean G. Ryan, Timothy C. Beers, Hiroyasu Ando - J. Lett , 2000
"... ..."
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Europium Isotope Ratios in s-Process-Element-Enhanced, Metal-Poor Stars: A New Probe of the 151 Sm Branching 1

by Wako Aoki, Sean G. Ryan, Nobuyuki Iwamoto, Timothy C. Beers, John E. Norris, Hiroyasu Ando, Toshitaka Kajino, Grant J. Mathews, Masayuki Y. Fujimoto , 2003
"... We report on the first measurement of the Eu isotope fractions ( 151 Eu and 153 Eu) in s-process-element-enhanced, metal-poor stars. We use these ratios to investigate the 151 Sm branching of s-process nucleosynthesis. The measurement was made by detailed study of Eu II lines that are significantly ..."
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affected by hyperfine splitting and isotope shifts in spectra of the carbon-rich, very metal-poor stars LP 625–44 and CS 31062–050, observed with the Subaru Telescope High Dispersion Spectrograph. The 151 Eu fractions [fr ( 151 Eu) = 151 Eu/ ( 151 Eu+ 153 Eu)] derived for LP 625–44 and CS 31062–050 are 0

IV. Metal–poor stars ⋆,⋆⋆

by J. R. De Medeiros, J. R. P. Silva, J. D. Do Nascimento, B. L. Canto Martins, L. Da Silva, C. Melo, M. Burnet , 2006
"... will be inserted by hand later) A catalog of rotational and radial velocities for evolved stars. ..."
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will be inserted by hand later) A catalog of rotational and radial velocities for evolved stars.

s- and r-process elements in two very metal-poor stars

by Sean G. Ryan, Wako Aoki, Lisa A. J. Blake, John E. Norris, Timothy C, Roberto Gallino, Maurizio Busso, Hiroyasu Ando , 2000
"... ABSTRACT. New measurements of neutron-capture elements are presented for two very metal-poor stars ([Fe/H] ∼ −3). One (LP 625-44) has an s-process signature believed to be due to mass transfer from a now-extinct metal-poor AGB companion, and the second (CS 22897-008) is one of a number of very meta ..."
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ABSTRACT. New measurements of neutron-capture elements are presented for two very metal-poor stars ([Fe/H] ∼ −3). One (LP 625-44) has an s-process signature believed to be due to mass transfer from a now-extinct metal-poor AGB companion, and the second (CS 22897-008) is one of a number of very

Chromospheres in Metal-Poor Stars

by Yoichi Takeda, Masahide Takada-hidai , 2010
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metal-poor halo stars

by M. Steffen, R. Cayrel, P. Bonifacio, H. -g. Ludwig, E. Caffau
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ASTRONOMY AND ASTROPHYSICS First UVES observations of beryllium in very metal-poor stars ⋆

by F. Primas, P. Molaro, P. Bonifacio, V. Hill
"... Abstract. We report on a attempt to detect beryllium in two dwarf stars of the Galactic halo with metallicities below one thousandth solar. The data were obtained during the Commissioning of the Ultraviolet and Visible Echelle Spectrograph (UVES) mounted on the ESO VLT Kueyen telescope, and show the ..."
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Abstract. We report on a attempt to detect beryllium in two dwarf stars of the Galactic halo with metallicities below one thousandth solar. The data were obtained during the Commissioning of the Ultraviolet and Visible Echelle Spectrograph (UVES) mounted on the ESO VLT Kueyen telescope, and show

Abundances in Very Metal-Poor Stars

by S. G. Ryan , 2000
"... Abstract: Metal-poor stars provide information on the characteristics and chemical evolution of the halo population of the Galaxy, the first epoch of star formation and Galaxy formation (not just locally but with relevance to high-redshift objects), and big bang nucleosynthesis. This review looks at ..."
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Abstract: Metal-poor stars provide information on the characteristics and chemical evolution of the halo population of the Galaxy, the first epoch of star formation and Galaxy formation (not just locally but with relevance to high-redshift objects), and big bang nucleosynthesis. This review looks

Nucleosynthesis in metal-poor AGB stars

by Thomas Masseron, Jennifer A. Johnson, Thomas Masseron , 2008
"... We present detailed abundance results concerning CEMP (Carbon Enhanced Metal-Poor) stars and the various subclasses. Statistical arguments from radial velocity monitoring show that these stars are all binaries and have mass transferred from a former AGB. Therefore these stars are the direct witnesse ..."
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We present detailed abundance results concerning CEMP (Carbon Enhanced Metal-Poor) stars and the various subclasses. Statistical arguments from radial velocity monitoring show that these stars are all binaries and have mass transferred from a former AGB. Therefore these stars are the direct

Abundanceratios In Galactic Metal-Poor Stars

by Ryan Physics Department, S. G. Ryan
"... . Metal-poor stars provide information on the characteristics and chemical evolution of the halo population of the Galaxy, the first epoch of star formation and Galaxy formation (not just locally but with relevance to high-redshift objects), and big bang nucleosynthesis. This paper looks at recent d ..."
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. Metal-poor stars provide information on the characteristics and chemical evolution of the halo population of the Galaxy, the first epoch of star formation and Galaxy formation (not just locally but with relevance to high-redshift objects), and big bang nucleosynthesis. This paper looks at recent
Results 1 - 10 of 1,541