First discovery of trans-iron elements in a DAO-type white dwarf (BD-22?3467)

Line: identification; Planetary nebulae: individual: A66 35; Stars: abundances; Stars: AGB and post-AGB; Stars: atmospheres; Stars: individual: BD-22?3467

Abstract :

[en] We have identified 484 lines of the trans-iron elements (TIEs) Zn, Ga, Ge, Se, Br, Kr, Sr, Zr, Mo, In, Te, I, Xe, and Ba, for the first time in the ultraviolet spectrum of a DAO-type white dwarf (WD), namely BD-22°3467, surrounded by the ionized nebula Abell 35. Our TIE abundance determination shows extremely high overabundances of up to 5 dex - a similar effect is already known from hot, H-deficient (DO-type) WDs. In contrast to these where a pulse-driven convection zone has enriched the photosphere with TIEs during a final thermal pulse and radiative levitation has established the extreme TIE overabundances, here the extreme TIE overabundances are exclusively driven by radiative levitation on the initial stellar metallicity. The very low mass (0.533+0.040-0.025M⊙) of BD-22°3467 implies that a third dredge-up with enrichment of s-process elements in the photosphere did not occur in the asymptotic giant branch (AGB) precursor. © 2019 The Author(s).

Disciplines :

Space science, astronomy & astrophysics
Physics

Author, co-author :

Löbling, L.; Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, Tübingen, D-72076, Germany

Maney, M. A.; Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, Tübingen, D-72076, Germany, Department of Astronomy and Astrophysics, Eberly College of Science, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, United States

Rauch, T.; Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, Tübingen, D-72076, Germany

Quinet, Pascal ; Université de Liège - ULiège > Département de physique > Spectroscopie atomique et Physique des atomes froids

Gamrath, S.; Physique Atomique et Astrophysique, Université de Mons - UMONS, Mons, B-7000, Belgium

Kruk, J. W.; NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States

Werner, K.; Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, Tübingen, D-72076, Germany

Language :

English

Title :

First discovery of trans-iron elements in a DAO-type white dwarf (BD-22?3467)

Publication date :

2020

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Oxford University Press

Volume :

492

Issue :

Pages :

528-548

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

NASA - National Aeronautics and Space Administration
DFG - Deutsche Forschungsgemeinschaft
BMBF - Bundesministerium für Bildung und Forschung
DADD - Deutscher Akademischer Austauschdienst
ESA - European Space Agency

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since 14 June 2021

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