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Results 1 - 10
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9,699
Abundances of s-process elements in
, 2006
"... Abstract. We identify emission lines of post-iron peak elements in very high signal-to-noise spectra of a sample of planetary nebulae. Analysis of lines from ions of Kr and Xe reveals enhancements in most of the PNe, in agreement with the theories of s-process in AGB star. Surprisingly, we did not d ..."
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Abstract. We identify emission lines of post-iron peak elements in very high signal-to-noise spectra of a sample of planetary nebulae. Analysis of lines from ions of Kr and Xe reveals enhancements in most of the PNe, in agreement with the theories of s-process in AGB star. Surprisingly, we did
Observations of r- and s-process elements in Population II stars a ∗
, 2002
"... The framework for the interpretation of neutron-capture elements observed in Population II stars, established 20-25 years ago, is that these stars primarily exhibit r-process signatures, due to the inefficiency of the s-process at low metallicity. A view developed later that the r-process might be u ..."
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The framework for the interpretation of neutron-capture elements observed in Population II stars, established 20-25 years ago, is that these stars primarily exhibit r-process signatures, due to the inefficiency of the s-process at low metallicity. A view developed later that the r-process might
Beyond the Iron Peak: r- and s-process Elemental Abundances in Stars with Planets
, 804
"... We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd and Eu (along with previously published abundances for C and Si) are presented. This study is one of the ..."
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We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd and Eu (along with previously published abundances for C and Si) are presented. This study is one
Enrichment of Very Metal-Poor Stars with Both r-Process and s-Process Elements from 8 − 10M ⊙ Stars
, 2005
"... Recent spectroscopic studies have revealed the presence of numerous carbon-enhanced, metalpoor stars with [Fe/H] < −2.0 that exhibit strong enhancements of s-process elements. These stars are believed to be the result of a binary mass-transfer episode from a former asymptotic giant-branch (AGB) c ..."
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Recent spectroscopic studies have revealed the presence of numerous carbon-enhanced, metalpoor stars with [Fe/H] < −2.0 that exhibit strong enhancements of s-process elements. These stars are believed to be the result of a binary mass-transfer episode from a former asymptotic giant-branch (AGB
The chemical composition of nearby young associations: s-process element abundances in AB Doradus, Carina-Near, and
"... ar ..."
A Subaru/HDS study of Lead (Pb) abundances in eight s-process-element-rich, metal-poor stars 1
, 2002
"... We report the abundances of neutron-capture elements in eight carbon-rich, metalpoor (−2.7 ≤[Fe/H] ≤ −1.9) stars observed with the Subaru Telescope High Dispersion Spectrograph. The derived abundance patterns indicate that the neutron-capture elements in these objects primarily originated from s-pro ..."
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We report the abundances of neutron-capture elements in eight carbon-rich, metalpoor (−2.7 ≤[Fe/H] ≤ −1.9) stars observed with the Subaru Telescope High Dispersion Spectrograph. The derived abundance patterns indicate that the neutron-capture elements in these objects primarily originated from s-process
Europium Isotope Ratios in s-Process-Element-Enhanced, Metal-Poor Stars: A New Probe of the 151 Sm Branching 1
, 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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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
unknown title
, 2004
"... (DOI: will be inserted by hand later) α-, r-, and s-process element trends in the Galactic thin and thick disks ⋆,⋆⋆ ..."
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(DOI: will be inserted by hand later) α-, r-, and s-process element trends in the Galactic thin and thick disks ⋆,⋆⋆
Lithium and s-process enrichment in massive galactic AGB stars
"... We present the first results of a wide observational program intended to study the effects of hot-bottom burning and of the third dredge-up in the chemical evolution of the most luminous AGB stars in our Galaxy. The main goal is to provide new observational constraints to the models through the anal ..."
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the analysis of lithium and s-process elements abundances in a carefully selected sample of galactic AGB stars. Our results indicate that, unlike observed in the Magellanic Clouds, the most massive AGB candidates in our Galaxy do not show any significant enrichment in s-process elements. In addition, only some
Results 1 - 10
of
9,699
