XMM-Newton Proposal 03005705

Physics

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Stars, White Dwarfs, Solar System, Ngc 6543, Ngc 6543, Ngc 6543, Ngc 6543, Ngc 6543, Xmm-Newton Proposal 03005705

Scientific paper

Planetary nebulae (PNe) consist of material ejected by stars with masses less than 8-10 solar masses. The current fast stellar wind sweeps up the previous slow AGB wind to form the PN shell, and the shell interior is expected to be filled with hot gas that emits X-rays. Chandra and XMM-Newton have detected diffuse X-rays from PNe at levels much lower than theoretical expectations. The different abundances of the fast stellar wind and the slow AGB wind traces the origin of the hot gas in PNe. We request XMM-Newton RGS observations of the two X-ray-brightest PNe, BD+30 3639 and NGC 6543, to determine the chemical abundances and origin of the hot gas and further use these to constrain the amount of heat conduction between the hot gas and the cool nebular shell.

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