Rotation in T Tauri stars. II. Clues for magnetic activity

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115386· OSTI ID:6966391

Bouvier, J ^[1]

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1. CNRS, Institut d'Astrophysique, Paris (France)

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. 121 refs.

• OSTI ID: 6966391
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 99; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BINARY STARS
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DWARF STARS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY LOSSES
ERUPTIVE VARIABLE STARS
HEATING
IONIZING RADIATIONS
LOSSES
MAGNETIC FIELDS
MOTION
RADIATION FLUX
RADIATIONS
ROTATION
SPECTRA
STARS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CORONAE
T TAURI STARS
VARIABLE STARS
X RADIATION