Link to the original picture here :
https://www.astrobin.com/full/317772/0/This image is a crop.
Last October I took a SHO picture of the heart nebula IC1805. Looking at my raws in Ha and OIII, I found this mysterious object which I deducted should be a planetary nebula. I never took time to analyse and found it's identity. Now it's done, planetary nebula confirmed with ID WeBo 1.
A binary system with a kind of ring.
Here's a description I found on the CDS Bibliographic service of the University of Strasbourg, France :
"WeBo 1 (PN G135.6+01.0), a previously unrecognized planetary nebula with a remarkable thin-ring morphology, was discovered serendipitously on Digitized Sky Survey images. The central star is found to be a late-type giant with overabundances of carbon and s-process elements. The giant is chromospherically active and photometrically variable, with a probable period of 4.7 days; this suggests that the star is spotted, and that 4.7 days is its rotation period. We propose a scenario in which one component of a binary system became an asymptotic giant branch (AGB) star with a dense stellar wind enriched in C and s-process elements; a portion of the wind was accreted by the companion, contaminating its atmosphere and spinning up its rotation. The AGB star has now become a hot subdwarf, leaving the optical companion as a freshly contaminated barium star inside an ionized planetary nebula."
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