Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..884d&link_type=abstract
Astronomicheskij Zhurnal, vol. 72, p. 884
Astronomy and Astrophysics
Astronomy
4
T Tauri Stars, Stellar Magnetic Fields, A Stars, Magnetic Clouds, B Stars, Stellar Evolution, Magnetic Flux, Fossils, Stellar Mass Accretion, Gas Ionization, Pre-Main Sequence Stars
Scientific paper
On the basis of an analysis of the observational data, it is established that T Tauri-type stars and Herbig Ae/Be stars form in magnetized gas-dust clouds. Evidence is presented that the magnetic field of Tauri-type stars is a fossil one. Evolution of the magnetic flux in the course of star formation is studied, and it is shown that T Tauri-type stars must have in their atmospheres a regular fossil magnetic field of the order of 1 KG prior to the development of convective instability. Taking into account magnetic braking of accretion permits us to remove the contradiction between the accretion rate and the observed luminosities and temperatures of T Tauri-type stars. The 'convection theorem' is formulated, which says that in cool stars at the stage of primary ionization of hydrogen and helium, convective instability develops independently of the fossil-magnetic-field intensity. Convective turbulization of the fossil magnetic field leads to field weakening to the level of dynamo nonlinear stabilization. Scale estimates of the dynamo field show that the difference of energies of the fossil and dynamo fields must be released in the form of stellar activity during the pre-main-sequence evolution of T Tauri-type stars.
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