Title: V453 Oph : a s-process enriched, but carbon-deficient RV Tauri star of low intrinsic metallicity
Authors: Deroo, Pieter ×
Reyniers, Maarten
Van Winckel, Hans
Goriely, S
Siess, L #
Issue Date: Aug-2005
Publisher: Springer-Verlag
Series Title: Astronomy & Astrophysics vol:438 issue:3 pages:987-998
Abstract: This paper reports the detection of a heavy element enriched RV Tauri variable with an abundance pattern that differs significantly from a standard s-process enriched object: V453 Oph. Based on optical high-resolution spectra, we determined that this object of low intrinsic metallicity ([ Fe/H] = -2.2) has a mild, but significant, enrichment ([ s/Fe] similar to +0.5) of heavy elements for which the distribution points to slow neutron capture nucleosynthesis. This result is strengthened 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 strong s-process signature, it is not accompanied by C enhancement, challenging our current nucleosynthetic models of post-AGB stars that predict a simultaneous enrichment in C and s-process elements. The low N abundance excludes CN cycling as being responsible for the low C abundance. We explore three different scenarios to explain the heavy element distribution in this evolved object: an enrichment of the parental cloud, an accretion scenario in which the chemical patterns were acquired by mass transfer in a binary system and an intrinsic enrichment by dredge-up.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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