منابع مشابه
Heavy Element Abundances in Blue Compact Galaxies
We present high-quality ground-based spectroscopic observations of 54 supergiant H II regions in 50 low-metallicity blue compact galaxies with oxygen abundances 12 + log O/H between 7.1 and 8.3. We use the data to determine abundances for the elements N, O, Ne, S, Ar and Fe. We also analyze Hubble Space Telescope (HST) Faint Object Spectrograph archival spectra of 10 supergiant H II regions to ...
متن کاملHalo Star Abundances and Heavy Element Nucleosynthesis
Abundance observations of neutron-capture elements in halo stars are providing a wealth of new information on the nature of heavy element nucleosynthesis in evolved stars. In particular these observations provide clues and constraints to the synthesis mechanisms for the n-capture elements, suggestions for the site (or sites) for the r-process and Galactic chemical evolution. We have been obtain...
متن کاملHeavy Element Abundances in AGB stars in 47 Tucanae
This research forms part of an investigation into heavy element abundances in Asymptotic Giant Branch (AGB) stars in various stellar environments. Seven giant stars in the southern globular cluster 47 Tuc have been observed using the Anglo-Australian Telescope. Abundances for five sand rprocess elements have been determined: the light s-process elements, Y and Zr; the heavy s-process elements, ...
متن کاملHeavy element abundances in giant stars of the globular clusters
Based on observations made with the Magellan Clay Telescope at Las Campanas Observatory.
متن کاملHeavy element abundances in planetary nebulae: A theorist’s perspective
The determination of heavy element abundances from planetary nebula (PN) spectra provides an exciting opportunity to study the nucleosynthesis occurring in the progenitor asymptotic giant branch (AGB) star. We perform post-processing calculations on AGB models of a large range of mass and metallicity to obtain predictions for the production of neutron-capture elements up to the first s-process ...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1989
ISSN: 0252-9211
DOI: 10.1017/s0252921100062795