Doppler shifts in the coma of Comet P/Halley

Astronomy and Astrophysics – Astronomy

Scientific paper

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Comet Nuclei, Doppler Effect, Halley'S Comet, Red Shift, Astronomical Spectroscopy, Charge Coupled Devices, Radial Velocity, Velocity Distribution, Comets, Halley, Comae, Doppler Shift, Velocity, Ccd Methods, Data, Comet Nuclei, Distance, Spectroscopy, Earth-Based Observations, Astronomy, Procedure, Diagrams

Scientific paper

The relative radial velocities across 70-100 arcsecs of the coma of Comet P/Halley were measured on four days in 1985-1986 on coude CCD spectrograms in order to search for detectable Doppler shifts. The measurements show a trend of positive velocity with respect to projected distance from the nucleus. The shifts are most clearly observed at r = 1.1 AU, where the relative velocity at 10000 km amounted to 3-4 km/s. The Doppler shifts represent an integration through the whole coma. It is suggested that a proper model of the comet is needed to convert the shifts into true outflow velocities.

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