Other
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985msngr..39...33b&link_type=abstract
ESO Messenger (ISSN 0722-6691), March 1985, p. 33-38.
Other
4
Angular Velocity, Dynamo Theory, Stellar Activity, Stellar Rotation, T Tauri Stars, X Ray Sources, Binary Stars, Cross Correlation, K Stars, Late Stars, Light Curve, Ophiuchi Clouds, Stellar Magnetic Fields, Stellar Spectra
Scientific paper
Techniques for determining the rotational velocities of faint stars are reviewed, and preliminary results from observations of 12 T Tau stars (six in the region of Rho Oph) obtained using the Coravel instrument (Benz and Mayor, 1980) on the 1.5-m Danish telescope at ESO during June 1984 are combined with published data on eight other T Tau stars (as well as selected RS CVn systems, dKe-dMe stars, and main-sequence G and K stars) and analyzed. Cross-correlation methods are shown to be more applicable to T Tau stars than those based on Fourier analysis. A log-log plot of the v sin i values determined by this technique versus published X-ray luminosities reveals that X-ray luminosity scales approximately with the square of the rotational velocity, consistent with dynamo models of surface activity in these objects.
Bertout Claude
Bouvier Jerome
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