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The Galactic Distribution and Subtype Evolution of Wolf-Rayet Stars

Published online by Cambridge University Press:  12 April 2016

B. Hidaya ,
A. G. Admiranto ,
K. R. Supeill  and
K. A. van der Hucht
B. Hidaya
Affiliation:
Observatorlum Bosscha, ITB, Lembang, West Java, Indonesia
A. G. Admiranto
Affiliation:
Observatorlum Bosscha, ITB, Lembang, West Java, Indonesia
K. R. Supeill
Affiliation:
Ministery of Science and Technology. BBPT, Jakarta, Indonesia
K. A. van der Hucht
Affiliation:
SRON Space Research Laboratory, Utrecht, The Netherlands

Abstract

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The galactic distribution of Wolf-Rayet stars is redetermined. In the solar neighbourhood within d < 2. 5 kpc the WN/WC number ratio is 0.54, indicating a larger influence of mass loss and convectlve overshooting than most present evolutionary models account for. The WR density gradient In the solar neighbourhood is constant. From a comparison of WR galactocentric distances and WR cluster and association membership, we find indications that WCE stars descend from WNL stars at R > 6.5 kpc, and that WCL stars descend from WNL stars at R < 8.5 kpc.

Type
Part II. Mass-Losing Stars in Different Stages of Evolution
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 152 - 153
Copyright
Copyright © Springer-Verlag 1988

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