Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Concerning the Classical Cepheid VIc Wesenheit Function's Strong
  Metallicity Dependence   Evidence is presented which supports findings that the classical Cepheid VIc
period-Wesenheit function is relatively insensitive to metallicity. The
viability of a recently advocated strong metallicity dependence was evaluated
by applying the proposed correction (gamma=-0.8 mag/dex) to distances
established for the Magellanic Clouds via a Galactic VIc Wesenheit calibration,
which is anchored to ten nearby classical Cepheids with measured HST
parallaxes. The resulting gamma-corrected distances for the Magellanic Clouds
(e.g., SMC, mu(0,gamma)~18.3) are in significant disagreement with that
established from a mean of >300 published estimates (NED-D), and a universal
Wesenheit template featuring eleven delta Scuti, SX Phe, RR Lyrae, and Type II
Cepheid variables with HST/Hipparcos parallaxes. Conversely, adopting a null
correction (i.e., gamma=0 mag/dex) consolidates the estimates. In tandem with
existing evidence, the results imply that variations in chemical composition
among Cepheids are a comparatively negligible source of uncertainty for
W(VIc)-based extragalactic distances and determinations of H_0. A new approach
is described which aims to provide additional Galactic Cepheid calibrators to
facilitate subsequent assessments of the VIc Wesenheit function's relative
(in)sensitivity to abundance changes. VVV/UKIDSS/2MASS JHKs photometry for
clusters in spiral arms shall be employed to establish a precise galactic
longitude-distance relation, which can be applied in certain cases to determine
the absolute Wesenheit magnitudes for younger Cepheids.

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The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph