An upper limit to the mass loss rate from the nuclei of planetary nebulae

Astronomy and Astrophysics – Astronomy

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Planetary Nebulae, Radio Emission, Stellar Mass Ejection, Ultraviolet Astronomy, Flux Density, Stellar Radiation

Scientific paper

Recent theoretical results and ultraviolet observations both suggest the existence of mass outflow from the central stars of planetary nebulae. Observations of the central stars of five nebulae with the VLA at 6-cm wavelength are described, in order to look for a resulting enhancement of radio emission at the position of the star. Upper limits derived indicate that for an assumed terminal velocity of 2000 km/s the mass loss rate does not exceed 2 x 10 to the -6th solar mass/yr.

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