Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Betelgeuse scope: Single-mode-fibers-assisted optical interferometer
  design for dedicated stellar activity monitoring   Betelgeuse has gone through a sudden shift in its brightness and dimmed
mysteriously. This is likely caused by a hot blob of plasma ejected from
Betelgeuse and then cooled to obscuring dust. If true, it is a remarkable
opportunity to directly witness the formation of dust around a red supergiant
star. Today's optical telescope facilities are not optimized for time-evolution
monitoring of the Betelgeuse surface, so in this work, we propose a low-cost
optical interferometer. The facility will consist of $12 \times 4$ inch optical
telescopes mounted on the surface of a large radio dish for interferometric
imaging; polarization-maintaining single-mode fibers will carry the coherent
beams from the individual optical telescopes to an all-in-one beam combiner. A
fast steering mirror assisted fiber injection system guides the flux into
fibers. A metrology system senses vibration-induced piston errors in optical
fibers, and these errors are corrected using fast-steering delay lines. We will
present the design.

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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th