In Search of the Rotation Rate of Wolf-Rayet Stars

Details In Search of the Rotation Rate of Wolf-Rayet Stars In Search of the Rotation Rate of Wolf-Rayet Stars

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99..132c&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.132

Astronomy and Astrophysics

Astronomy

Scientific paper

The rotation rate of Wolf-Rayet (WR) stars is a fundamental parameter, but still entirely unknown. However, for certain WRs, it is currently well known that perturbations at the surface propagate in the wind and generate large-scale structures. The affect of the star's rotation on these structures, called Co-rotating Interacting Regions (CIR), can be seen by spirals generated in the wind, which in turn produce periodic variations in spectral lines. By studying the frequency of these variations it is possible to determine the rotation period, and thus the rotation rate of WR stars. The following shows how we monitored several CIRs in numerous stars in order to determine the intrinsic rotation rate of WR stars.

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