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- W3100481918 abstract "We present an independent confirmation of the zero-point offset of ${rm it Gaia}$ Data Release 2 (DR2) parallaxes using asteroseismic data of evolved stars in the ${rm it Kepler}$ field. Using well-characterized red giant branch (RGB) stars from the APOKASC-2 catalogue we identify a ${rm it Gaia}$ astrometric pseudo-color ($nu_{rm eff}$)- and ${rm it Gaia}$ $G$-band magnitude-dependent zero-point offset of $varpi_{rm seis} - varpi_{Gaia} = 52.8 pm 2.4 {rm (rand.)} pm 8.6 {rm (syst.)} - (150.7 pm 22.7)(nu_{rm eff} - 1.5) - (4.21 pm 0.77)(G - 12.2) mu{rm as}$, in the sense that ${rm it Gaia}$ parallaxes are too small. The offset is found in high and low-extinction samples, as well as among both shell H-burning red giant stars and core He-burning red clump stars. We show that errors in the asteroseismic radius and temperature scales may be distinguished from errors in the ${rm it Gaia}$ parallax scale. We estimate systematic effects on the inferred global ${rm it Gaia}$ parallax offset, $c$, due to radius and temperature systematics, as well as choices in bolometric correction and the adopted form for ${rm it Gaia}$ parallax spatial correlations. Because of possible spatially-correlated parallax errors, as discussed by the ${rm it Gaia}$ team, our ${rm it Gaia}$ parallax offset model is specific to the ${rm it Kepler}$ field, but broadly compatible with the magnitude- and color-dependent offset inferred by the ${rm it Gaia}$ team and several subsequent investigations using independent methods." @default.
- W3100481918 created "2020-11-23" @default.
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- W3100481918 date "2019-06-21" @default.
- W3100481918 modified "2023-10-02" @default.
- W3100481918 title "Confirmation of the <i>Gaia</i> DR2 Parallax Zero-point Offset Using Asteroseismology and Spectroscopy in the <i>Kepler</i> Field" @default.
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- W3100481918 doi "https://doi.org/10.3847/1538-4357/ab1f66" @default.
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