1998A&A...333..629A


Query : 1998A&A...333..629A

1998A&A...333..629A - Astronomy and Astrophysics, volume 333, 629-643 (1998/5-2)

Modelling the angular momentum evolution of low-mass stars with core-envelope decoupling.

ALLAIN S.

Abstract (from CDS):

We present a model of angular momentum evolution for stars in the mass range 0.5-1.1M, during their early stages of evolution. The model is based upon the following hypothesis: a constant surface rotational period during star-disk interaction, angular momentum loss through magnetic wind, and differential rotation parameterized with a constant coupling time. We investigate the effect of the different parameters, the initial velocity at the T Tauri age, the disk lifetime, the magnetic braking law, and we discuss the effect of introducing a core-envelope decoupling. The angular momentum transfer is parameterized by the use of a coupling time scale τc, which controls the exchanges of angular momentum between the - fast-rotating - radiative core and the convective envelope, both supposed to rotate as solid bodies. We present evolutionary tracks of a single star through the pre-main sequence and the main-sequence, for different masses and different coupling time-scales. We conclude that rapid rotators require solid-body rotation, and ZAMS slow rotator require a strong differential decoupling with a characteristic coupling time about 100Myr.

Abstract Copyright:

Journal keyword(s):

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1039 OpC 02 42 07 +42 43.3           ~ 395 0
2 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 795 0
3 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3183 0
4 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2843 0
5 IC 2391 OpC 08 41 10 -52 59.5           ~ 766 0
6 IC 2602 OpC 10 42 27 -64 25.6           ~ 610 0
7 NGC 6475 OpC 17 53 47 -34 50.5           ~ 355 0

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2022.05.20-18:41:31

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