2002ApJ...578L..55S

Query : 2002ApJ...578L..55S

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.

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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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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 3132 PN 10 07 01.7656422504 -40 26 11.130553032   10.14 10.01     A2V 423 1
2 IC 4593 PN 16 11 44.5479462840 +12 04 17.031388584   10.91 10.84     O7fp 462 0
3 PN SwSt 1 PN 18 16 12.2834104368 -30 52 07.906578996   12.1 11.10     [WC9/10] 301 0
4 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 976 0
5 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1

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