Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VLT/MUSE discovers a jet from the evolved B[e] star MWC 137   Not all stars exhibiting the optical spectral characteristics of B[e] stars
share the same evolutionary stage. The Galactic B[e] star MWC 137 is a prime
example of an object with uncertain classification, with previous work
suggesting pre- and post-main sequence classification. Our goal is to settle
this debate and provide reliable evolutionary classification. Integral field
spectrograph observations with VLT MUSE of the cluster SH 2-266 are used to
analyze the nature of MWC 137. A collimated outflow is discovered that is
geometrically centered on MWC 137. The central position of MWC 137 in the
cluster SH 2-266 within the larger nebula suggests strongly that it is a member
of this cluster and that it is both at the origin of the nebula and the newly
discovered jet. Comparison of the color-magnitude diagram of the brightest
cluster stars with stellar evolutionary models results in a distance of about
5.2$\pm$1.4 kpc. We estimate that the cluster is at least 3 Myr old. The jet
extends over 66" (1.7 pc) projected on the plane of the sky, shows several
knots, and projected velocities of up to $\pm$450 km s$^{-1}$. From the Balmer
emission line decrement of the diffuse intracluster nebulosity we determine
E(B-V)=1.4 mag for the inner 1' cluster region. The spectral energy
distribution of the brightest cluster stars yield a slightly lower extinction
of E(B-V)~1.2 mag. The extinction towards MWC 137 is estimated to be E(B-V)~1.8
mag (A$_V$~5.6 mag). Our analysis of the optical and near-infrared
color-magnitude and color-color diagrams suggests a post-main sequence stage of
MWC 137. The existence of a jet in this object implies the presence of an
accretion disk.

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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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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: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph