منابع مشابه
The angular momentum evolution of low-mass stars
We present a model for the evolution of surface rotation of stars in themass range from 0.5 to 1.1M , from their first appearance in theHRdiagramasTTauri stars up to the age of the Sun. The model is based on 3 assumptions: i) nearly solid-body rotation, ii) pre-main sequence disk locking, iii) wind braking. The initial conditions and the calibration of the braking law are completely determined ...
متن کاملA constraint on the angular momentum evolution of Be stars
The Be star sample of Steele et al. (1998) has a distribution of v sin i’s that is luminosity dependant, with giants having lower projected rotational velocities than dwarfs. We show that this effect can be understood simply in terms of angular momentum conservation during the evolution from dwarf to giant. Any decretion disk or other angular momentum losing mechanism for such objects must caus...
متن کاملAngular Momentum Evolution of Young Stars: toward a Synthesis of Observations, Theory, and Modeling
1 The aim of this AAS Topical Session was to update the community on the current state of knowledge about the angular momentum evolution of young stars. For newcomers to the subject, the session was intended to provide an introduction and general overview, and to highlight emerging issues. For experienced workers in this field, the session provided an opportunity for synthesizing recent develop...
متن کامل(ngc 1039) and the Evolution of Angular Momentum and Activity in Young Solar-type Stars
We analyze Keck Hires observations of rotation and activity in F, G, and K dwarf members of the open cluster M34 (NGC 1039), which is 250 Myr old, and we compare them to the Pleiades, Hyades, and NGC 6475. The upper bound to rotation seen in M34 is about a factor of two lower than for the 100 Myr-old Pleiades, but most M34 stars are well below this upper bound, and it is the overall convergence...
متن کاملThe Angular Momentum of Accreting Neutron Stars
I review the rotation measurements of accreting neutron stars. Many of the highly magnetic (B > 10 G) accreting X-ray pulsars have been continuously observed with the Burst and Transient Source Experiment (BATSE) aboard the Compton Gamma-Ray Observatory (CGRO) since April 1991. These observations show that the accretion torque exerted on many disk-fed accreting X-ray pulsars changes sign on a m...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2013
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921314001793