Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..361...15h&link_type=abstract
Active OB-Stars: Laboratories for Stellar and Circumstellar Physics, ASP Conference Series, Vol. 361, Proceedings of the confere
Physics
2
Scientific paper
The observational effects of rotation on outflows in OB stars are reviewed. Direct evidence of global asymmetries in outflows resulting from moderate rotation are subtle and ambiguous. `Discrete absorption components' have been suggested as indicators of time-dependent rotational modulation, and recurrence timescales do correlate, loosely, with the line-width parameter v sin i, but the underlying mechanism remains elusive; neither magnetic fields nor pulsations offer a satisfactory framework for the interpretation of these episodic features. However, where truly periodic signals are observed in hot-star winds, they are associated with strong magnetic fields; new results on two early-type stars illustrate this. Finally, the role of rapid (near-critical) rotation in Be stars is examined. A simple statistical analysis is used to argue that the observed distribution of v sin i values is consistent with Be stars rotating at ˜95% of critical, which allows `weak' processes (operating at or near the sound speed) to play a significant role in the production of keplerian viscous decretion disks.
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