Period-luminosity relation of delta Sct stars from OGLE-IV and the CzeV catalogues

In this article, the period-luminosity (P-L) relation is determined of delta Sct stars, based on a strictly selected sample of 483 stars from the OGLE-IV Galactic bulge fileds, together with 547 delta Sct, of which 52 are high-amplitude delta Sct stars (HADS) from the CzeV catalogue using Gaia DR2 parallaxes and apparent magnitudes. Absolute magnitudes were corrected for interstellar extinction using the Planck thermal foreground dust maps and the 3D Bayestar probabilistic dust map. Where possible, the CzeV catalogue periods were compared with photometric measurements from the TESS mission.