Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Runaway Yellow Supergiant Star in the Small Magellanic Cloud   We recently discovered a yellow supergiant (YSG) in the Small Magellanic
Cloud (SMC) with a heliocentric radial velocity of ~300 km/s which is much
larger than expected for a star in its location in the SMC. This is the first
runaway YSG ever discovered and only the second evolved runaway star discovered
in a different galaxy than the Milky Way. We classify the star as G5-8I, and
use de-reddened broad-band colors with model atmospheres to determine an
effective temperature of 4700+/-250K, consistent with what is expected from its
spectral type. The star's luminosity is then L/Lo ~ 4.2+/-0.1, consistent with
it being a ~30Myr 9Mo star according to the Geneva evolution models. The star
is currently located in the outer portion of the SMC's body, but if the star's
transverse peculiar velocity is similar to its peculiar radial velocity, in
10Myr the star would have moved 1.6 degrees across the disk of the SMC, and
could easily have been born in one of the SMC's star-forming regions. Based on
its large radial velocity, we suggest it originated in a binary system where
the primary exploded as a supernovae thus flinging the runaway star out into
space. Such stars may provide an important mechanism for the dispersal of
heavier elements in galaxies given the large percentage of massive stars that
are runaways. In the future we hope to look into additional evolved runaway
stars that were discovered as part of our other past surveys.

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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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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: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs