Suzaku detection of a highly carbon enriched plasma in BD +30°3639

We have observed the X-ray brightest planetary nebula BD +30° 3639 with the new Japanese astronomical satellite Suzaku. With its superior spectral resolution back-illuminated CCD camera, a blend of K-lines from highly ionized C, N, O elements are successfully resolved into individual species, and an extremely high relative abundance ratio of C/O $∼$ 40 is obtained. This strongly suggests the direct measurement of the helium shell-burning products.