SIMBAD references

2002ApJ...578L..55S - Astrophys. J., 578, L55-L58 (2002/October-2)

Discovery of enhanced germanium abundances in planetary nebulae with the Far Ultraviolet Spectroscopic Explorer.

STERLING N.C., DINERSTEIN H.L. and BOWERS C.W.

Abstract (from CDS):

We report the discovery of Ge III λ1088.46 in the planetary nebulae (PNe) SwSt 1, BD+30°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-process and therefore can be self-enriched in PNe, is enhanced by factors of ≥3-10. The strongest evidence for enrichment is seen for PNe with Wolf-Rayet central stars, which are likely to contain heavily processed material.

Abstract Copyright: ∼

Journal keyword(s): Line: Identification - Nuclear Reactions, Nucleosynthesis, Abundances - ISM: Planetary Nebulae: General - ISM: Planetary Nebulae: Individual: Alphanumeric: BD+30 3639 - ISM: Planetary Nebulae: Individual: Alphanumeric: IC 4593 - ISM: Planetary Nebulae: Individual: NGC Number: NGC 3132 - ISM: Planetary Nebulae: Individual: Alphanumeric: SwSt 1 - Stars: AGB and Post-AGB - Ultraviolet: ISM

Simbad objects: 5

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