Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272..763g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 4, pp. 763-771.
Astronomy and Astrophysics
Astronomy
35
Accretion, Accretion Discs, Stars: Magnetic Fields, Stars: Pre-Main-Sequence, Stars: Rotation
Scientific paper
Observed rotation periods of T Tauri stars (TTS) lie in the range 1<~P (days) <~10, with a `fast rotator' group centred at P~3 d, and a `slow rotator' group centred at P~8 d. I show here that such periods are a natural consequence of the tendency of spin-down accretion torques to regulate the stellar rotation rates to values near the equilibrium rates determined by the interaction between circumstellar accretion discs and dynamo-generated magnetic fields of these stars. According to the theory sketched here, in a plot of stellar rotation periods against a parameter g, which depends on stellar properties and the accretion rate, TTS are expected to lie at or below a `spin-down line'. In a more approximate version of the theory, which utilizes an empirical correlation between the masses and accretion rates of TTS, the controlling parameter, g_cor, depends on stellar properties alone. Predictions from both theories are in agreement with observations. I discuss the role of both classical and weak-lined TTS in this view of pre-main-sequence angular momentum regulation.
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