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Recently, a deviation of the Gaia TGAS parallaxes from the asteroseismic onesfor giants was found. We show that for parallaxes $\varpi<1.5$ mas it can beexplained by a selection effect in favour of bright and luminous giants in theTycho-2 and TGAS catalogues. Another explanation of this deviation seems to bevalid for $\varpi>1.5$ mas based on the best extinction estimates: thedeviation may be caused not by a bias of parallax, but by an underestimation ofthe extinction (and, consequently, an overestimation of the calculated absolutemagnitude) in the asteroseismic results. We demonstrate that the reliableestimates of the reddening and extinction (about 0.22 mag of the visualextinction for the Kepler field) better fit both the giants and main sequencestars to the PARSEC, MIST and YaPSI isochrones.

On the discrepancy between asteroseismic and Gaia DR1 TGAS parallaxes