Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: TGAS Error Renormalization from the RR Lyrae Period-Luminosity Relation   The Gaia team has applied a renormalization to their internally-derived
parallax errors $\sigma_{\rm int}(\pi)$ $$ \sigma_{tgas}(\pi) =
\sqrt{[A\sigma_{int}(\pi)]^2 + \sigma_0^2}; \ \ \ \ (A,\sigma_0) = (1.4,0.20\
\rm mas) $$ based on comparison to Hipparcos astrometry. We use a completely
independent method based on the RR Lyrae $K$-band period-luminosity relation to
derive a substantially different result, with smaller ultimate errors $$
(A,\sigma_0) = (1.1,0.12\ \rm mas) \ \ \ \ (this\ paper). $$ We argue that our
estimate is likely to be more accurate and therefore that the reported TGAS
parallax errors should be reduced according to the prescription: $$
\sigma_{true}(\pi) = \sqrt{(0.79\sigma_{tgas}(\pi))^2 - (0.10\ \rm mas)^2}. $$

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The categories of this paper are: q-fin
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int