Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical parameters of RR Lyrae stars in NGC 6171   We present an analysis of VI CCD time-series photometry of the globular
cluster NGC 6171. The main goal is to determine individual physical parameters
for single-mode RR Lyrae stars present in the field of view of our images, by
means of light curve Fourier decomposition and well-established calibrations
and zero-points. This leads to the estimation of the mean values of the
metallicity and distance for the parental cluster. From the RRab stars we find
[Fe/H]ZW = -1.33 +- 0.12 and a distance d = 5.3 +- 0.3 kpc and from the RRc
stars we find [Fe/H]ZW = -1.02 +- 0.19 and a distance d = 5.3 +- 0.2 kpc.
Independent methods, such as the P-L relations for RRab and SX Phe stars enable
the estimation of a weighted average distance to the cluster of 5.4 +- 0.1 kpc.
We confirm the amplitude modulations of the Blazhko type of five RRab and the
non-membership of V21 to the cluster. The colour-magnitude diagram is
consistent with an age of 11 Gyrs. The distribution of RRab and RRc stars seems
well segregated around the first overtone red edge of the instability strip.
This positions NGC 6171 among OoI type clusters where the pulsating modes are
neatly separated in the HB. We report two new irregular variables of the Lb
type.

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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
1
The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: funct-an