Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraining Dust Extinction Properties via the VVV Survey   Near-infrared color-excess and extinction ratios are essential for
establishing the cosmic distance scale and probing the Galaxy, particularly
when analyzing targets attenuated by significant dust. A robust determination
of those ratios followed from leveraging new infrared observations from the VVV
survey, wherein numerous bulge RR Lyrae and Type II Cepheids were discovered,
in addition to $BVJHK_{s}(3.4\rightarrow22)\mu m$ data for classical Cepheids
and O-stars occupying the broader Galaxy. The apparent optical color-excess
ratios vary significantly with Galactic longitude ($\ell$), whereas the
near-infrared results are comparatively constant with $\ell$ and Galactocentric
distance ($\langle E(J-\overline{3.5\mu m})/E(J-K_s) \rangle =1.28\pm0.03$).
The results derived imply that classical Cepheids and O-stars display separate
optical trends ($R_{V,BV}$) with $\ell$, which appear to disfavor theories
advocating a strict and marked decrease in dust size with increasing
Galactocentric distance. The classical Cepheid, Type II Cepheid, and RR Lyrae
variables are characterized by $\langle A_{J}/E(J-K_s) \rangle = \langle
R_{J,JK_s} \rangle =1.49\pm0.05$ ($\langle A_{K_s}/A_J \rangle =0.33\pm0.02$),
whereas the O-stars are expectedly impacted by emission beyond $3.6 \mu m$. The
mean optical ratios characterizing classical Cepheids and O-stars are
approximately $\langle R_{V,BV} \rangle \sim3.1$ and $\langle R_{V,BV} \rangle
\sim3.3$, respectively.

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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: dg-ga