Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A geometrical 1% distance to the short-period binary Cepheid V1334 Cygni   Cepheid stars play a considerable role as extragalactic distances indicators,
thanks to the simple empirical relation between their pulsation period and
their luminosity. They overlap with that of secondary distance indicators, such
as Type Ia supernovae, whose distance scale is tied to Cepheid luminosities.
However, the Period-Luminosity (P-L) relation still lacks a calibration to
better than 5%. Using an original combination of interferometric astrometry
with optical and ultraviolet spectroscopy, we measured the geometrical distance
d = 720.35+/-7.84 pc of the 3.33 d period Cepheid V1334 Cyg with an
unprecedented accuracy of +/-1 %, providing the most accurate distance for a
Cepheid. Placing this star in the P-L diagram provides an independent test of
existing period-luminosity relations. We show that the secondary star has a
significant impact on the integrated magnitude, particularly at visible
wavelengths. Binarity in future high precision calibrations of the P-L
relations is not negligible, at least in the short-period regime. Subtracting
the companion flux leaves V1334 Cyg in marginal agreement with existing
photometric-based P-L relations, indicating either an overall calibration bias
or a significant intrinsic dispersion at a few percent level. Our work also
enabled us to determine the dynamical masses of both components, M1 = 4.288 +/-
0.133 Msun (Cepheid) and M2 = 4.040 +/- 0.048 Msun (companion), providing the
most accurate masses for a Galactic binary Cepheid system.

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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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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: hep-lat
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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: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg