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Title:
Excess barium in a K dwarf-white dwarf binary system.
Authors:
Jeffries, R. D.; Smalley, B.
Publication:
Astronomy and Astrophysics, v.315, p.L19-L22 (A&A Homepage)
Publication Date:
11/1996
Origin:
A&A via CDS
A&A Keywords:
STARS: ABUNDANCES, STARS: CARBON, BINARIES: GENERAL, STARS: ROTATION, STARS: WHITE DWARFS, ULTRAVIOLET: STARS
Bibliographic Code:
1996A&A...315L..19J

Abstract

We present spectroscopic evidence for an excess of the s-process element barium, in the rapidly rotating, K-dwarf component of the wide binary system 2REJ0357+283. The secondary star is a hot white dwarf (WD) and our result argues for a model where the K-star has accreted mass and angular momentum from the asymptotic giant branch progenitor of the WD and lends strong support to the wind-accretion hypothesis for barium giant formation. If our tentative detection of excess carbon can be confirmed, then we propose that 2REJ0357+283 is very similar to the two dwarf carbon star plus hot WD binary systems that have been found recently.

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