Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical Evolution of Rotating Stellar Systems: III. The Effect of Mass
  Spectrum   We have studied the dynamical evolution of rotating star clusters with mass
spectrum using a Fokker-Planck code. As a simplest multi-mass model, we first
investigated the two-component clusters. Rotation is found to accelerate the
dynamical evolution through the transfer of angular momentum outward, as well
as from the high masses to the low masses. However, the degree of acceleration
depends sensitively on the assumed initial mass function since dynamical
friction, which generates mass segregation, also tends to accelerate the
evolution, and the combined effect of both is not linear or multiplicative. As
long as dynamical friction dominates in the competition with angular momentum
exchange the heavy masses lose random energy and angular momentum, sink towards
the centre, but their remaining angular momentum is sufficient to speed them up
rotationally. This is gravo-gyro instability. As a consequence, we find that
the high mass stars in the central parts rotate faster than low mass stars.
This leads to the suppression of mass segregation compared to the non-rotating
clusters. From the study of multi-component models, we observe similar trends
to the two-component models in almost all aspects. The mass function changes
less drastically for clusters with rotation. Unlike non-rotating clusters, the
mass function depends on $R$ and $z$. Our models are the only ones that can
predict mass function and other quantities to be compared with new
observations.

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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom