There is increasing evidence that the dynamo mechanism in dMe flare stars differs from the alphaOmega dynamo believed to operate in the Sun. We review existing observational constraints on the dynamo and then present new constraints. In particular, we show that the magnetic field on Gliese 729 has been constant for 1.5 years, despite large variations in Hα equivalent width. This has implications for chromospheric heating and the existence of stellar cycles in flare stars. We also present preliminary polarimetry of AD Leo, demonstrating the the field is not globally organized. We discuss these results in the context of existing dynamo models.
Cool Stars, Stellar Systems, and the Sun
- Pub Date:
- MAGNETIC FIELDS;
- STELLAR CYCLES;
- FLARE STARS;