SIMBAD references

2005A&A...433..641W - Astronomy and Astrophysics, volume 433, 641-645 (2005/4-2)

Fluorine in extremely hot post-AGB stars: Evidence for nucleosynthesis.


Abstract (from CDS):

We have discovered lines of highly ionized fluorine (FV and FVI) in the far-UV spectra of extremely hot (Teff=85000-150000K) 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.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution - stars: AGB and post-AGB - stars: white dwarfs

CDS comments: HS 2324+397 is HS 2324+3944 in SIMBAD

Simbad objects: 18

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