Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nearby debris disk systems with high fractional luminosity reconsidered   By searching the IRAS and ISO databases we compiled a list of 60 debris disks
which exhibit the highest fractional luminosity values (fd>10^-4) in the
vicinity of the Sun (d<120pc). Eleven out of these 60 systems are new
discoveries. Special care was taken to exclude bogus disks from the sample. We
computed the fractional luminosity values using available IRAS, ISO, and
Spitzer data, and analysed the galactic space velocities of the objects. The
results revealed that stars with disks of high fractional luminosity often
belong to young stellar kinematic groups, providing an opportunity to obtain
improved age estimates for these systems. We found that practically all disks
with fd>5x10^-4 are younger than 100Myr. The distribution of the disks in the
fractional luminosity versus age diagram indicates that (1) the number of old
systems with high fd is lower than was claimed before; (2) there exist many
relatively young disks of moderate fractional luminosity; and (3) comparing the
observations with a current theoretical model of debris disk evolution a
general good agreement could be found.

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The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
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The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
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The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an