Vega’s heliocentric radial velocity is 13.9 km / s (violet shift). What factor for a given radial velocity value is decisive in the frame

Vega’s heliocentric radial velocity is 13.9 km / s (violet shift). What factor for a given radial velocity value is decisive in the frame of reference associated with nearby stars: the motion of Vega or the motion of the Sun?

The standard solar apex, determined by the stars visible to the naked eye, is located in the constellation Hercules near Bega. The radial velocity of the Sun in the direction of the apex is 19.5 km / s. Consequently, the radial velocity of Begi is mainly determined by the motion of the Sun.

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