From red giants to planetary nebulae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Planetary Nebulae, Red Giant Stars, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Stellar Winds, Astronomical Spectroscopy, Conservation Laws, Momentum Theory, Stellar Spectra

Scientific paper

The transition from red giants to planetary nebulae is studied by comparing the spectral characteristics of red giant envelopes and planetary nebulae. Observational and theoretical evidence both suggest that remnants of red giant envelopes may still be present in planetary nebula systems and should have significant effects on their formation. The dynamical effects of the interaction of stellar winds from central stars of planetary nebulae with the remnant red giant envelopes are evaluated and the mechanism found to be capable of producing the observed masses and momenta of planetary nebulae. The observed mass-radii relation of planetary nebulae may also be best explained by the interacting winds model. The possibility that red giant mass loss, and therefore the production of planetary nebulae, is different between Population I and II systems is also discussed.

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