Top panel: sky map of all the stars in the sample overplotted over a DSS-red image of the region. Dashed yellow line indicates the galactic plane, and the central green cross marks the center of Per OB1 (as defined in Mel’nik & Dambis 2017). Green circles indicated the location of the h and χ Persei double cluster. Colored vectors indicate the individual proper motion of each star. Middle and bottom panels: parallax and RV of the spectrum with the highest S/N, respectively, for each star in the sample against their position in right ascension. Open circles and square symbols indicate stars that deviate more than 2σ from the mean of the distribution of parallaxes and RVs, respectively (see Sects. 4.1 and 4.4.1). Stars with bad astrometry (see Sect. 2.3) are indicated with a plus, and no proper motion vectors are overplotted.