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Mass loss from central stars of planetary nebulae by WC spectrum

Published online by Cambridge University Press:  07 August 2017

J.A. de Freitas Pacheco  and
R.D.D. Costa
J.A. de Freitas Pacheco
Affiliation:
Instituto Astronômico e Geofísico, Universidade de SÃo Paulo, Brazil
R.D.D. Costa
Affiliation:
Instituto Astronômico e Geofísico, Universidade de SÃo Paulo, Brazil

Abstract

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We derived mass loss rates for 5 central stars (CS) having WC spectrum:NGC 5315, BD+30 3639, He2-99, He2-113, SwSt-1. The values are substantially higher than other previous estimates based on UV data. We consider that those stars have winds in which hydrogen is highly deficient (or absent) with helium and carbon being the dominant elements. The new mass loss rates reduce the timescale for the evolution along the horizontal track, but discrepancies with kinematic timescales still persist.

Keywords

Planetary nebulaeWolf-Rayet starsMass loss
Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 149: The Stellar populations of Galaxies , 1992 , pp. 419
Copyright
Copyright © Kluwer 

References

Cerruti-Sola, M., Perinotto, M. (1985), Ap.J. 291, 237.CrossRefGoogle Scholar
Costa, R.D.D. and de Freitas Pacheco, J.A. (1991) in preparation.Google Scholar
Pottasch, S.R. (1987) in Planetary and Proto-Planetary Nebulae: From IRAS to ISO. Reidel, Dordrecht pg. 79.Google Scholar