Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..946b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, March 1990, p. 946-964.
Astronomy and Astrophysics
Astronomy
146
Dynamo Theory, Emission Spectra, Magnetoactivity, Stellar Magnetic Fields, Stellar Rotation, T Tauri Stars, Binary Stars, Dwarf Stars, Late Stars, Stellar Coronas, Stellar Spectra, X Ray Sources
Scientific paper
The rotation rates of Bouvier et al. (1986) are used to study correlations between the rotation of T Tauri stars and their radiative energy losses in the X-ray range and in the H-alpha Ca II - K and Mg II - k lines. It is found that T Tauri star X-ray flux primarily depends on rotation, with a correlation between X-ray fluxes and rotation similar to that found for cool dwarfs and active binaries. It is suggested that this X-ray/rotation correlations is due to a solar-type magnetic dynamo. Also, it is shown that Ca II - K and Mg II - k losses scale with H-alpha line strength over three decades of flux from weak-line to classical and extreme T Tauri stars. Evidence for the existence of a solar-type magnetic dynamo in T Tauri stars and limits to the contribution of a magnetic dynamo to the atmospheric heating are examined.
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