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astro-ph1999
The Kinematics of Point-Symmetric Planetary Nebulae: Observational Evidence of Precessing Outflows
Martin A. Guerrero
The discovery of collimated outflows associated to point-symmetric features in Planetary Nebulae has proliferated in recent years. The systematic variation of radial velocity that…
astro-ph1999
X-rays from Planetary Nebulae
You-Hua Chu, Martin A. Guerrero, Robert A. Gruendl
Two sources of X-ray emission are expected from planetary nebulae: the hot central stars with K, and shocked fast stellar winds at temperatures of 10 K.…