| Full text | |
| Author(s): |
Guerrero, G.
;
Smolarkiewicz, P. K.
;
de Gouveia Dal Pino, E. M.
;
Kosovichev, A. G.
;
Zaire, B.
;
Mansour, N. N.
;
Nandy, D
;
Valio, A
;
Petit, P
Total Authors: 9
|
| Document type: | Journal article |
| Source: | LIVING AROUND ACTIVE STARS; v. 12, n. S328, p. 8-pg., 2017-01-01. |
| Abstract | |
The role of tachoclines, the thin shear layers that separate solid body from differential rotation in the interior of late-type stars, in stellar dynamos is still controversial. In this work we discuss their relevance in view of recent results from global dynamo simulations performed with the EULAG-MHD code. The models have solar-like stratification and different rotation rates (i.e., different Rossby number). Three arguments supporting the key role of tachoclines are presented: the solar dynamo cycle period, the origin of torsional oscillations and the scaling law of stellar magnetic fields as function of the Rossby number. This scaling shows a regime where the field strength increases with the rotation and a saturated regime for fast rotating stars. These properties are better reproduced by models that consider the convection zone and a fraction of the radiative core, naturally developing a tachocline, than by those that consider only the convection zone. (AU) | |
| FAPESP's process: | 13/10559-5 - Investigation of high energy and plasma astrophysics phenomena: theory, numerical simulations, observations, and instrument development for the Cherenkov Telescope Array (CTA) |
| Grantee: | Elisabete Maria de Gouveia Dal Pino |
| Support Opportunities: | Special Projects |