Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Protostars and stars in the Coronet cluster: Age, evolution, and cluster
  structure   We present new optical spectroscopy with FLAMES/VLT, near-IR imaging with
HAWK-I/VLT, and 870 micron mapping with APEX/LABOCA of the Coronet cluster. The
optical data allow to estimate spectral types, extinction and the presence of
accretion in 6 more M-type members, in addition to the 12 that we had
previously studied. The submillimeter maps and near-IR data reveal the presence
of nebular structures and high extinction regions, which are in some cases
associated to known IR, optical, and X-ray sources. Most star formation is
associated to two elongated structures crossing in the central part of the
cluster. Placing all the 18 objects with known spectral types and extinction in
the HR diagram suggests that the cluster is younger than previously thought (<2
Myr, and probably ~0.5-1 Myr). The new age estimate is in agreement with the
evolutionary status of the various protostars in the region and with its
compactness (<1.3 pc across), but results in a conflict with the low disk and
accretion fraction (only 50-65% of low-mass stars appear to have protoplanetary
disks, and most transitional and homologously depleted disks are consistent
with no accretion) and with the evolutionary features observed in the mid-IR
spectra and spectral energy distributions of the disks.

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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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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: hep-th
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: chao-dyn