Article Dans Une Revue Astronomy & Astrophysics - A&A Année : 2011

Visibilities and bolometric corrections for stellar oscillation modes observed by Kepler

Résumé

Context.Kepler produces a large amount of data used for asteroseismological analyses, particularly of solar-like stars and red giants. The mode amplitudes observed in the Kepler spectral band have to be converted into bolometric amplitudes to be compared to models.
Aims: We give a simple bolometric correction for the amplitudes of radial modes observed with Kepler, as well as the relative visibilities of non-radial modes.
Methods: We numerically compute the bolometric correction cK-bol and mode visibilities for different effective temperatures Teff within the range 4000-7500 K, using a similar approach to a recent one from the literature.
Results: We derive a law for the correction to bolometric values: cK - bol = 1 + a1(Teff - To) + a2(Teff - To)2, with To = 5934 K, a1 = 1.349 × 10-4 K-1, and a2 = -3.120 × 10-9 K-2 or, alternatively, as the power law cK - bol = (Teff/To)alpha with alpha = 0.80. We give tabulated values for the mode visibilities based on limb-darkening (LD), computed from ATLAS9 model atmospheres for Teff ∈ [4000,7500] K, log g ∈ [2.5,4.5] , and [M/H] ∈ [ - 1.0, + 1.0] . We show that using LD profiles already integrated over the spectral band provides quick and good approximations for visibilities. We point out the limits of these classical visibility estimations.

Dates et versions

hal-03742629 , version 1 (02-08-2022)

Identifiants

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Jérôme Ballot, Caroline Barban, C. van 'T Veer-Menneret. Visibilities and bolometric corrections for stellar oscillation modes observed by Kepler. Astronomy & Astrophysics - A&A, 2011, 531, pp.124. ⟨10.1051/0004-6361/201016230⟩. ⟨hal-03742629⟩
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