Discovery of Enhanced Germanium Abundances in Planetary Nebulae with FUSE

@article{Sterling2002DiscoveryOE,
  title={Discovery of Enhanced Germanium Abundances in Planetary Nebulae with FUSE},
  author={N. C. Sterling and Harriet L. Dinerstein and Charles W. Bowers},
  journal={arXiv: Astrophysics},
  year={2002}
}
We report the discovery of Ge III $\lambda$1088.46 in the planetary nebulae (PNe) SwSt 1, BD+30$^{\rm o}$3639, NGC 3132, and IC 4593, observed with the Far Ultraviolet Spectroscopic Explorer. This is the first astronomical detection of this line and the first measurement of Ge (Z = 32) in PNe. We estimate Ge abundances using S and Fe as reference elements, for a range of assumptions about gas-phase depletions. The results indicate that Ge, which is synthesized in the initial steps of the s… Expand
The Production of Germanium in Asymptotic Giant Branch stars
Observations of planetary nebulae by Sterling, Dinerstein and Bowers have revealed enhancements in the element Germanium (Ge) by factors of 3 to 10 compared to solar. Germanium can be produced byExpand
Physical properties of the fluorine and neutron-capture element-rich PN Jonckheere 900
We performed detailed spectroscopic analyses of a young C-rich planetary nebula (PN) Jonckheere900 (J900) in order to characterise the properties of the central star and nebula. Of the derived 17Expand
Germanium, Arsenic, and Selenium Abundances in Metal-Poor Stars
The elements germanium (Ge, Z = 32), arsenic (As, Z = 33), and selenium (Se, Z = 34) span the transition from charged-particle or explosive synthesis of the iron-group elements to neutron-captureExpand
Accurate determination of energy levels, hyperfine structure constants, lifetimes and dipole polarizabilities of triply ionized tin isotopes
We have investigated energies, magnetic dipole hyperfine structure constants ($A_{hyf}$) and electric dipole (E1) matrix elements of a number of low-lying states of the triply ionized tin (Sn$^{3+}$)Expand
Physical Conditions and Chemical Abundances in Photoionized Nebulae from Optical Spectra
This chapter presents a review on the latest advances in the computation of physical conditions and chemical abundances of elements present in photoionized gas (H ii regions and planetary nebulae).Expand

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