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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This paper reports the detection of a heavy element enriched RV Taurivariable with an abundance pattern that differs significantly from a standards-process enriched object: V453 Oph. Based on optical high-resolution spectra,we determined that this object of low intrinsic metallicity ([Fe/H] = -2.2) hasa mild, but significant, enrichment ([s/Fe] ~ +0.5) of heavy elements for whichthe distribution points to slow neutron capture nucleosynthesis. This result isstrengthened by a comparative analysis to the non-enriched RV Tauri star DS Aqr([s/Fe] = 0.0). Although V453 Oph is the first RV Tauri star showing a strongs-process signature, it is NOT accompanied by C enhancement, challenging ourcurrent nucleosynthetic models of post-AGB stars that predict a simultaneousenrichment in C and s-process elements. The low N abundance excludes CN cyclingas being responsible for the low C abundance. We explore three differentscenarios to explain the heavy element distribution in this evolved object: anenrichment of the parental cloud, an accretion scenario in which the chemicalpatterns were acquired by mass transfer in a binary system and an intrinsicenrichment by dredge-up.Comment: Accepted for publication in A&

V453 Oph: a s-process enriched, but carbon-deficient RV Tauri star of low intrinsic metallicity