Excess barium in a K dwarf-white dwarf binary system.

Details Excess barium in a K dwarf-white dwarf binary system. Excess barium in a K dwarf-white dwarf binary system.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l..19j&link_type=abstract

Astronomy and Astrophysics, v.315, p.L19-L22

Astronomy and Astrophysics

Astrophysics

19

Stars: Abundances, Stars: Carbon, Binaries: General, Stars: Rotation, Stars: White Dwarfs, Ultraviolet: Stars

Scientific paper

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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