A comparison between observed and predicted mass loss rates and wind momentum of O stars

Details A comparison between observed and predicted mass loss rates and wind momentum of O stars A comparison between observed and predicted mass loss rates and wind momentum of O stars

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ssrv...66..153l&link_type=abstract

Space Science Reviews, Volume 66, Issue 1-4, pp. 153-161

Physics

O Stars, Mass Loss, Radiatively Driven Winds

Scientific paper

Empirical mass-loss rates were derived for 28 luminous O stars from radio fluxes and Hα equivalent widths. Comparison with theoretical values predicted by the theory of radiatively driven winds reveals a discrepancy of 0.30±0.05 dex, with the theoretical values being too low. We show that there is not only a mass-loss discrepancy but also a momentum flux discrepancy. The theoretically predicted momentum fluxes are too low by 0.17±0.04 dex. This discrepancy is independent of the adopted stellar mass. We demonstrate that the momentum discrepancy in the most luminous O stars is comparable to the one found in the least extreme Wolf-Rayet stars. We suggest that the physical reason for the break-down of the theory in Wolf-Rayet stars and the most luminous O stars may be related.

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