On the use of Gaia magnitudes and new tables of bolometric corrections

By Luca Casagrande, D. VandenBerg. Monthly Notices of the Royal Astronomical Society Letters, 2018

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The availability of reliable bolometric corrections and reddening estimates, rather than the quality of parallaxes will be one of the main limiting factors in determining the luminosities of a large fraction of Gaia stars. With this goal in mind, we provide Gaia G, BP and RP synthetic photometry for the entire MARCS grid, and test the performance of our synthetic colours and bolometric corrections against space-borne absolute spectrophotometry. We find indication of a magnitude-dependent offset in Gaia DR2 G magnitudes, which must be taken into account in high accuracy investigations. Our interpolation routines are easily used to derive bolometric corrections at desired stellar parameters, and to explore the dependence of Gaia photometry on Teff, log(g), [Fe/H], alpha-enhancement and E(B-V). Gaia colours for the Sun and Vega, and Teff-dependent extinction coefficients, are also provided.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/495cc381736f6237b31695380b564fe6ce4a772b

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Citations in the corpus

Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18 (2019, result): “While these are of an unprecedented precision, several recent works (Weiler 2018; Maíz Apellániz & Weiler 2018; Casagrande & VandenBerg 2018) have shown by comparison with absolute spectrophotometry that the G band suffers from a magnitude-dependent offset, and that the nominal passbands need to be…”
Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc (2019, background): “…as suggested by Weiler (2018), with 2 different zero points, filters and photometric calibrations for the GBP photometry for G brighter and fainter than 11 mag and a correction for the G magnitude drift (Arenou et al. 2018; Weiler 2018; Casagrande & VandenBerg 2018) of 3.5 mmag per magnitude.”