English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Previous studies aiming at the iron-abundance determination in three PG 1159stars (K 1-16, PG 1159-035, NGC 7094) and a [WC]-PG 1159 transition star (Abell78) have revealed that no object shows any iron line in the UV spectrum. Thestars are iron-deficient by at least 1 dex, typically. A possible explanationis that iron nuclei were transformed by neutron captures into heavier elements(s-process), however, the extent of the iron-destruction would be much strongerthan predicted by AGB star models. But if n-captures are the right explanation,then we should observe an enrichment of trans-iron elements. In this paper wereport on our search for a possible nickel overabundance in one of the four Fedeficient PG 1159 stars, namely the central star NGC 7094. We are unable toidentify any nickel line in HST and FUSE spectra and conclude that Ni is notoverabundant. It is conceivable that iron was transformed into even heavierelements, but their identification suffers from the lack of atomic data.

UV and FUV spectroscopy of the hybrid PG 1159-type central star NGC 7094