The First Determination of the Rotation Rates of Wolf-Rayet Stars

Details The First Determination of the Rotation Rates of Wolf-Rayet Stars The First Determination of the Rotation Rates of Wolf-Rayet Stars

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..250..139c&link_type=abstract

Massive Stars as Cosmic Engines, Proceedings of the International Astronomical Union, IAU Symposium, Volume 250, p. 139-144

Astronomy and Astrophysics

Astronomy

1

Stars: Wolf-Rayet, Stars: Rotation, Stars: Winds, Outflows

Scientific paper

The most recent stellar models have shown that the faster a massive star spins, the more its nuclear yields, mass-loss rate and lifetime are different from the standard model. One thus needs to know the rotation rate of massive stars to trace their evolutionary tracks adequately. In Wolf-Rayet (WR) stars, the direct measurement of the rotational velocity is impossible, since their continuum emission is formed in the dense wind that hides the hydrostatic, stellar surface. Here, we present a technique to derive the rotation rates of WR stars from a periodic wind phenomenon, the corotating interaction regions (CIR). For five WR stars, a first estimate of the rotation rates has been deduced from the CIR periods.

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