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WeBo 1 (PN G135.6+01.0), a previously unrecognized planetary nebula with aremarkable thin-ring morphology, was discovered serendipitously on DigitizedSky Survey images. The central star is found to be a late-type giant withoverabundances of carbon and s-process elements. The giant is chromosphericallyactive and photometrically variable, with a probable period of 4.7 days; thissuggests that the star is spotted, and that 4.7 days is its rotation period. Wepropose a scenario in which one component of a binary system became an AGB starwith a dense stellar wind enriched in C and s-process elements; a portion ofthe wind was accreted by the companion, contaminating its atmosphere andspinning up its rotation. The AGB star has now become a hot subdwarf, leavingthe optical companion as a freshly contaminated barium star inside an ionizedplanetary nebula.Comment: 4 pages, 3 figures; Accepted for January 2003 issue of Astronomical  Journa

W[CLC]e[/CLC]B[CLC]o[/CLC] 1: A Young Barium Star Surrounded by a Ringlike Planetary Nebula