Morphologies of planetary nebulae ejected by close-binary nuclei

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Binary Stars, Planetary Nebulae, Stellar Evolution, Stellar Structure, Asymptotic Giant Branch Stars, Charge Coupled Devices, Iue, Stellar Envelopes, Stellar Mass Ejection, Stellar Winds

Scientific paper

This paper examines the observed morphologies of planetary nebulae (PNs) that are known to have close-binary nuclei, in the light of theoretical studies of common-envelope ejection followed by wind shaping. Some of the physical aspects of the spiraling-in process and PN ejection are described, and the subsequent shaping of the PN via a stellar wind is examined. A list of the PNs known to have close-binary nuclei is presented together with the imagery of these PNs. The observed morphologies are discussed in the context of the theoretical predictions.

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