T Tauri variables

Physics

Scientific paper

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Astronomical Photometry, Stellar Physics, T Tauri Stars, Variable Stars, Brightness, Light Curve, Photosphere, Radii, Stellar Color

Scientific paper

A review is given of the variability characteristics of T Tauri stars monitored at Van Vleck Observatory. A list of T Tauri stars with known rotation periods is compiled and used to compare limits on the radii, derived from v sin i measures, with expectation based on the luminosities and effective temperatures of the stars. The large-amplitude quasi-perodic or aperiodic component of the light variation, which is more typical of the T Tauri phenomenon than periodic behavior, is discussed. Correlations between brightness and color and brightness and spectral change are reviewed. A typical time scale of 30 to 60 days is suggested for the phenomenon in the Van Vleck Observatory sample. A plausible interpretation of the variability is given, which involves the growth and decay of active regions on the photosphere of the star.

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