Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the pulsation modes of OGLE small amplitude red giant variables in
  the LMC   We discuss the properties of pulsations in the OGLE Small Amplitude Red
Giants (OSARGs) in the Large Magellanic Cloud (LMC). We consider stars below
the red-giant tip in this paper. They are multi-periodic and form three
sequences in the period-luminosity plane. Comparing the periods and period
ratios with our theoretical models, we have found that these sequences
correspond to radial first to third overtones, and nonradial dipole p$_4$ and
quadrupole p$_2$ modes. The red-giant branch stars of OSARGs consist of stars
have initial masses of $\sim0.9 - 1.4M_\odot$ which corresponds to a luminosity
range of $\log L/L_\odot \simeq 2.8 - 3.4$. With these parameters, the scaled
optimal frequency $\nu_{\rm max}$ for solar-like oscillations goes through
roughly the middle of the three sequences in the period-luminosity plane,
suggesting the stochastic excitation is likely the cause of the pulsations in
OSARGs.

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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
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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: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio