Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The pre-main sequence star HD 34282: A very short period delta
  Scuti-type pulsator   HD 34282 has been found to pulsate during a systematic search for short-term
photometric variability in Herbig Ae/Be stars with the goal of determining the
position and size of the pre-main sequence instability strip. Simultaneous
Stromgren photometry is used in the frequency analysis, yielding two
frequencies with values of nu1=79.5 and nu2=71.3 c/d. The light curve with the
largest amplitude is that of the u band. This behaviour, which is not common
for delta Scuti stars, is explained as pulsation in a high radial order in
stars near the blue edge of the instability strip. The main period, with a
value of 18.12 min, represents the shortest period observed so far for a delta
Scuti-type pulsator. A seismic modelling, including instability predictions and
rotation effects, has been attempted. It is found that both main sequence and
pre-main sequence models predict modes in the range of 56 to 82 c/d (between
648 and 949 microHz), corresponding to oscillations of radial order n from 6 to
8. The highest of the observed frequencies only becomes unstable for models of
low metallicity, in agreement with results from spectroscopic measurements.

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The categories of this paper are: chem-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: hep-th
1
The categories of this paper are: cs