Clumping-corrected mass-loss rates of Wolf-Rayet stars

Details Clumping-corrected mass-loss rates of Wolf-Rayet stars Clumping-corrected mass-loss rates of Wolf-Rayet stars

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333..956n&link_type=abstract

Astronomy and Astrophysics, v.333, p.956-969 (1998)

Astronomy and Astrophysics

Astrophysics

99

Stars: Atmospheres, Stars: Mass-Loss, Stars: Wolf-Rayet, Radio Continuum: Stars

Scientific paper

Mass-loss rates of Galactic Wolf-Rayet stars have been determined from their radio emission power and spectral index (alpha = dln {f_ν} / dln ν), accounting for the clumped structure and (potential) variable ionization in their outer winds. The average spectral index between mm- and cm- wavelengths is ~ 0.77 for WN stars and ~ 0.75 for WC stars, in contrast with ~ 0.58 expected for smooth winds. The observed wavelength dependence of alpha can be explained using clumped wind models in some cases, with shocks (at 30-100 stellar radii) producing a higher ionization zone in the outer wind. We obtain an empirical formula relating mass-loss with observed optical emission line equivalent widths, with application to stars without measured radio fluxes. Clumping-corrected mass-loss rates are generally lower than those obtained by current smooth wind models. Specifically we find log \mdot(clumpy)-log \mdot(smooth)=-0.19 (sigma=0.28) for WN stars, and log \mdot(clumpy)-log \mdot(smooth)=-0.62 (sigma=0.19) for WC stars. New mass-loss rate estimates agree very well with (clumping independent) determinations of WR components in binary systems.

Affiliated with

Also associated with

No associations

Rating

Clumping-corrected mass-loss rates of Wolf-Rayet stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Clumping-corrected mass-loss rates of Wolf-Rayet stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clumping-corrected mass-loss rates of Wolf-Rayet stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1363188