Poster abstract details

The planetary nebula (PN) A 30 is one of the few cases of a born-again PN, where hydrogen-deficient knots are located at a close range of the central star. The cometary appearance of these knots, with bow-shock structures pointing towards the central star and fanning tails radiating away, suggests that they have been ablated. XMM-Newton and Chandra observations of A 30 have been obtained. We find diffuse X-ray emission associated with the petal-like structures interior to the round exterior shell. We also find an unexpectedly bright, unresolved point-source at the position of the central star. However, the X-ray emission expected from its photosphere is negligible. Wind-intrinsic shocks or the termination shock of a hot bubble are alternative mechanisms capable of producing the observed X-ray flux, given the available kinetic energy in the stellar wind.