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Title:
Rotation in T Tauri stars. II - Clues for magnetic activity
Authors:
Bouvier, J.
Affiliation:
AA(CNRS, Institut d'Astrophysique, Paris, France)
Publication:
Astronomical Journal (ISSN 0004-6256), vol. 99, March 1990, p. 946-964. (AJ Homepage)
Publication Date:
03/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
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
DOI:
10.1086/115386
Bibliographic Code:
1990AJ.....99..946B

Abstract

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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