Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The IGRINS YSO Survey I. Stellar parameters of pre-main sequence stars
  in Taurus-Auriga   We present fundamental parameters for 110 canonical K- & M-type
(1.3$-$0.13$M_\odot$) Taurus-Auriga young stellar objects (YSOs). The analysis
produces a simultaneous determination of effective temperature ($T_{\rm eff}$),
surface gravity ($\log$ g), magnetic field strength (B), and projected
rotational velocity ($v \sin i$). Our method employed synthetic spectra and
high-resolution (R$\sim$45,000) near-infrared spectra taken with the Immersion
GRating INfrared Spectrometer (IGRINS) to fit specific K-band spectral regions
most sensitive to those parameters. The use of these high-resolution spectra
reduces the influence of distance uncertainties, reddening, and
non-photospheric continuum emission on the parameter determinations. The median
total (fit + systematic) uncertainties were 170 K, 0.28 dex, 0.60 kG, 2.5 km
s$^{-1}$ for $T_{\rm eff}$, $\log$ g, B, and $v \sin i$, respectively. We
determined B for 41 Taurus YSOs (upper limits for the remainder) and find
systematic offsets (lower $T_{\rm eff}$, higher $\log$ g and $v \sin i$) in
parameters when B is measurable but not considered in the fit. The average
$\log$ g for the Class II and Class III objects differs by 0.23$\pm$0.05dex,
which is consistent with Class III objects being the more evolved members of
the star-forming region. However, the dispersion in $\log$ g is greater than
the uncertainties, which highlights how the YSO classification correlates with
age ($\log$ g), yet there are exceptionally young (lower $\log$ g) Class III
YSOs and relatively old (higher $\log$ g) Class II YSOs with unexplained
evolutionary histories. The spectra from this work are provided in an online
repository along with TW Hydrae Association (TWA) comparison objects and the
model grid used in our analysis.

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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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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: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an