Ultraviolet spectra of planetary nebulae. III. Mass loss from the central star of NGC 6543.
Lutz, J. H.; Seaton, M. J.; Castor, J. I.
United States, United Kingdom
Abstract
An ultraviolet spectrum of the central star of NGC 6543 has been obtained at low dispersion with the short wave camera of the IUE satellite, and the terminal velocity of the stellar wind has been estimated at 2150 km/s. By assuming the effective temperature to be the Zanstra temperature of 43,000 K and the luminosity to be that derived from the evolutionary tracks of Paczynski (1971), the stellar radius is found to be 0.8 solar radius. A mass loss rate of the order of 10 to the -7th solar masses per year is deduced from the optically thin UV P Cygni lines and found to be reasonably consistent with the lambda 4686 He II emission. No evidence of marked abundance anomalies in the central star has been found.