Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...433..641w&link_type=abstract
Astronomy and Astrophysics, Volume 433, Issue 2, April II 2005, pp.641-645
Astronomy and Astrophysics
Astrophysics
49
Stars: Abundances, Stars: Evolution, Stars: Agb And Post-Agb, Stars: White Dwarfs
Scientific paper
We have discovered lines of highly ionized fluorine (ion{F}{v} and ion{F}{vi}) in the far-UV spectra of extremely hot (T_eff = 85 000-150 000 K) post-AGB stars. Our sample comprises H-rich central stars of planetary nebulae as well as H-deficient PG1159 stars. We performed non-LTE calculations and find strong F overabundances (up to 10-4 by mass, i.e., 250 times solar) in a number of PG1159 stars, while F is essentially solar in the H-rich stars. Since PG1159 stars are believed to exhibit intershell matter of the preceding AGB phase on their surface, their chemical analyses allow for a direct insight into nucleosynthesis processes during the AGB phase. The high F abundances in PG1159 stars confirm the conclusion from abundance determinations in giants, that F is synthesized in AGB stars and that the F enrichment in the intershell must be very high.
Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985.
Kruk Jeff W.
Rauch Thomas
Werner Kirstin
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