Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematics and Velocity Ellipsoid of Halo Red Giants   In the present paper, we aim to determine the kinematical properties,
velocity ellipsoid, and Oort constants using a sample of halo red giants. The
study is based mainly on the space and radial velocities of about 1583 red
giant stars collected from the SEGUE-1 and SEGUE-2 surveys. We divided the
sample into three subsamples, the inner halo, the outer halo and the stars near
the galactic plane. The fitting of the radial velocity equation gives a the
mean of Oort constants, A = 15.6 +- 1.6 km s-1 kpc-1 and B= -13.9 +- 1.8 km s-1
kpc-1, the angular velocity |A-B|= 29.5 +- 0.2 km s-1 kpc-1 implying a
rotational velocity of 221.25 +- 26.66 km s-1 if we take the distance to the
Galactic center as 7.5 kpc.

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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: cs
28
The categories of this paper are: alg-geom