Measurement of the angular momenta of pre-main-sequence stars: early evolution of slow and fast rotators and empirical constraints on spin-down torque …
M Kounkel, KG Stassun, LA Hillenbrand… - The Astronomical …, 2023 - iopscience.iop.org
The Astronomical Journal, 2023•iopscience.iop.org
We use TESS full-frame imaging data to investigate the angular momentum evolution of
young stars in the Orion Complex. We confirm recent findings that stars with rotation periods
faster than 2 days are overwhelmingly binaries, with typical separations of tens of au; such
binaries quickly clear their disks, leading to a tendency for rapid rotators to be diskless.
Among (nominally single) stars with rotation periods slower than 2 days, we observe the
familiar gyrochronological horseshoe-shaped relationship of rotation period versus T eff …
young stars in the Orion Complex. We confirm recent findings that stars with rotation periods
faster than 2 days are overwhelmingly binaries, with typical separations of tens of au; such
binaries quickly clear their disks, leading to a tendency for rapid rotators to be diskless.
Among (nominally single) stars with rotation periods slower than 2 days, we observe the
familiar gyrochronological horseshoe-shaped relationship of rotation period versus T eff …
Abstract
We use TESS full-frame imaging data to investigate the angular momentum evolution of young stars in the Orion Complex. We confirm recent findings that stars with rotation periods faster than 2 days are overwhelmingly binaries, with typical separations of tens of au; such binaries quickly clear their disks, leading to a tendency for rapid rotators to be diskless. Among (nominally single) stars with rotation periods slower than 2 days, we observe the familiar gyrochronological horseshoe-shaped relationship of rotation period versus T eff, indicating that the processes that govern the universal evolution of stellar rotation on gigayear timescales are already in place within the first few megayears. Using spectroscopic
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