Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A KELT-TESS Eclipsing Binary in a Young Triple System Associated with a
  "Stellar String" Theia 301   HD 54236 is a nearby, wide common-proper-motion visual pair that has been
previously identified as likely being very young by virtue of strong X-ray
emission and lithium absorption. Here we report the discovery that the brighter
member of the wide pair, HD~54236A, is itself an eclipsing binary (EB),
comprising two near-equal solar-mass stars on a 2.4 d orbit. It represents a
potentially valuable opportunity to expand the number of benchmark-grade EBs at
young stellar ages. Using new observations of Ca2H&K emission and lithium
absorption in the wide K-dwarf companion, HD 54236B, we obtain a robust age
estimate of 225 +/- 50 Myr for the system. This age estimate and Gaia proper
motions show HD 54236 is associated with Theia~301, a newly discovered local
"stellar string", which itself may be related to the AB Dor moving group
through shared stellar members. Applying this age estimate to AB~Dor itself
alleviates reported tension between observation and theory that arises for the
luminosity of the 90M_Jup star/brown dwarf AB Dor C when younger age estimates
are used.

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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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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: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con