Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Detailed Light Curve Evolution of V1674 Her (Nova Her 2021)   We report high-cadence photometry of the ultra-fast ($t_2\sim1.2$ d) nova
V1674 Her during its rise to maximum light ($V\sim6.3$) and the beginning of
its subsequent decline. These observations from Evryscope and the Mount Laguna
Observatory All-Sky Camera reveal a plateau in the pre-maximum light curve at
$g\sim14$ ($\sim$8 mag below peak) that lasted for at least three hours.
Similar features (so-called pre-maximum halts) have been observed in some novae
near maximum light, but to our knowledge the detection of a plateau in the
light curve $\sim$8 mag below peak is unprecedented.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys