Symbiotic stars with Wolf-Rayet spectra as protoplanetary nebulae?

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Symbiotic Stars, Wolf-Rayet Stars, Planetary Nebulae

Scientific paper

Symbiotic systems, in particular symbiotic novae, have been suggested to be very early stages of planetary nebulae. Some of them have been described as going through a Wolf-Rayet phase. We argue that there may be a direct relation between symbiotic objects and planetary nebulae, and that the Wolf-Rayet phase is connected to an active spell of the hot companion. Symbiotic stars could lead to planetary nebulae with two central stars with different radiation temperatures and luminosities, where each has the power to ionize a planetary nebula on its own.

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