Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BD+14$^\circ$3061: A Luminous Yellow Post-AGB Star in the Galactic Halo   I report the discovery that the 9th-magnitude Galactic-halo star
BD+14$^\circ$3061 is a member of the rare class of luminous metal-poor "yellow
post-AGB" stars. Its Gaia DR2 parallax implies an absolute magnitude of
$M_V=-3.44\pm0.27$, and it is a very high-velocity star moving in a retrograde
Galactic orbit. BD+14$^\circ$3061 is a field analog of the half-dozen yellow
PAGB stars known in Galactic globular clusters, which have closely similar
absolute magnitudes. These objects are the visually brightest members of old
stellar populations; their apparently narrow luminosity function makes them
potentially useful as Population II standard candles. The spectral-energy
distribution of BD+14$^\circ$3061 out to $22\,\mu$m shows no evidence for
circumstellar dust. The star is a low-amplitude semi-regular pulsating
variable, with typical periods of 30-32 days. A radial-velocity study suggests
that it is a spectroscopic binary with a period of 429.6 days, making it
similar to known binary yellow PAGB stars such as HD 46703 and
BD+39$^\circ$4926.

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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn