Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Mass and Radius of the Neutron Star in EXO 1745-248   Bursting X-ray binaries in globular clusters are ideal sources for measuring
neutron star masses and radii, and hence, for determining the equation of state
of cold, ultradense matter. We use time-resolved spectroscopic data from EXO
1745-248 during thermonuclear bursts that show strong evidence for photospheric
radius expansion to measure the Eddington flux and the apparent surface area of
the neutron star. We combine this with the recent measurement of the distance
to the globular cluster Terzan 5, where this source resides, to measure the
neutron star mass and radius. We find tightly constrained pairs of values for
the mass and radius, which are centered around M=1.4 M_sun and R=11 km or
around M=1.7 M_sun and R=9 km. These values favor nucleonic equations of state
with symmetry energy that is relatively low and has a weak dependence on
density.

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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex