Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Observational Signatures of Convectively Excited Internal Gravity
  Modes in Main Sequence Stars   We predict the flux and surface velocity perturbations produced by
convectively excited gravity modes (g-modes) in main sequence stars. Core
convection in massive stars can excite g-modes to sufficient amplitudes to be
detectable with high precision photometry by Kepler and CoRoT, if the thickness
of the convective overshoot region is < 30 per cent of a pressure scale height.
The g-modes manifest as excess photometric variability, with amplitudes of ~ 10
micromagnitudes at frequencies ~ 10 microHz (0.8 1/d) near the solar
metallicity zero-age main sequence. The flux variations are largest for stars
with M > 5 solar masses, but are potentially detectable down to M ~ 2 - 3 solar
masses. During the main sequence evolution, radiative damping decreases such
that ever lower frequency modes reach the stellar surface and flux
perturbations reach up to ~ 100 micromagnitudes at the terminal-age main
sequence. Using the same convective excitation model, we confirm previous
predictions that solar g-modes produce surface velocity perturbations of < 0.3
mm/s. This implies that stochastically excited g-modes are more easily
detectable in the photometry of massive main sequence stars than in the Sun.

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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: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn