Investigating Gaia EDR3 parallax systematics using asteroseismology of Cool Giant Stars observed by Kepler, K2, and TESS II. Deciphering Gaia parallax systematics using red clump stars

Understand

We analyse Gaia EDR3 parallax systematics as a function of magnitude and sky location using a recently published catalogue of 12,500 asteroseismic red-giant star distances.

• We selected ~ 3500 red clump (RC) stars of similar chemical composition as the optimal subsample for this purpose.
• We perform a detailed assessment of systematic uncertainties relevant for parallax offset estimation based on the asteroseismic distances.
• Following this assessment, we adopt for our baseline analysis the asteroseismic parameters measured as in Elsworth et al.