Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillation mode identifications and models for the delta Scuti star FG
  Virginis   We present new spectroscopic and photometric time series observations of the
delta Scuti star FG~Vir. We detect the oscillations via changes in the
equivalent widths of hydrogen and metal absorption lines. From the ratios
between spectroscopic and photometric amplitudes, we assign l values to the
eight strongest oscillation modes. In particular, we identify two radial modes
(l =0) and find that the main pulsation mode (147 microHz) has l = 1. One of
the radial modes (at 140 microHz) is the fundamental, implying that two modes
with lower frequencies are g-modes. For the radial modes, we compare
frequencies with those calculated from a scaled delta Scuti star model and
derive a density 0.1645 +/- 0.0005 rho_sol. We then obtain a distance of 84 +/-
3 pc, in excellent agreement with the Hipparcos value. Finally, we suggest that
a 3.5-day variability in all observables (equivalent widths and intensity) is
caused by stellar rotation.

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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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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
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys