Abstract:The evolution of the parameters of the residual velocity ellipsoid of hot subdwarfs (HSDs) with their position relative to the Galactic plane is traced, using the HSDs selected by Geier et al. from the Gaia DR2 catalog. Parameters of the Galactic rotation are determined for two |z| zones. These are used to estimate the gradient of the circular rotation velocity, V 0 , versus |z|, found to be ∆V 0 /∆|z| = −71 ± 7 km s −1 kpc −1 . The size of the residual velocity ellipsoid is (σ 1 , σ 2 , σ 3 ) = (36.1, 27.6, 2… Show more
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