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Mikkel Nørup Lund

Bolometric corrections of stellar oscillation amplitudes as observed by the Kepler, CoRoT, and TESS missions

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A better understanding of the amplitudes of stellar oscillation modes and surface granulation is essential for improving theories of mode physics and the properties of the outer convection zone of solar-like stars. A proper prediction of these amplitudes is also essential for appraising the detectability of solar-like oscillations for asteroseismic analysis. Comparisons with models, or between different photometric missions, are enabled by applying a bolometric correction, which converts mission-specific amplitudes to their corresponding bolometric (full light) values. We derive the bolometric correction factor for amplitudes of radial oscillation modes and surface granulation as observed by the Kepler, CoRoT, and TESS missions. The calculations are done assuming a stellar spectrum given by a black-body as well as by synthetic spectral flux densities from 1D model atmospheres. We derive a power-law and polynomial relations for the bolometric correction as a function of temperature from the black-body approximation and evaluate the deviations from adopting a more realistic spectrum. Across the full temperature range from 4000 to 7500 K, the amplitudes from TESS are in the black-body approximation predicted to be a factor similar to 0.83-0.84 times those observed by Kepler. We find that using more realistic flux spectra over the black-body approximation can change the bolometric correction by as much as similar to 30 per cent at the lowest temperatures, but with a change typically within similar to 5-10 per cent around a T-eff of 5500-6000 K. We find that after T-eff, the bolometric correction most strongly depends on [M/H], which could have an impact on reported metallicity dependences of amplitudes reported in the literature.

OriginalsprogEngelsk
TidsskriftMonthly Notices of the Royal Astronomical Society
Vol/bind489
Nummer1
Sider (fra-til)1072-1081
Antal sider10
ISSN0035-8711
DOI
StatusUdgivet - okt. 2019

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