Notes. Column 1: star names for the identified cases or name given by us; (1): Vela X-1. Column 2: group number for each object. Galactic coordinates l,b: from Simbad or corresponding references for Group 7 sources (Table 5, fifth column). Spectral types: for B-type stars from Simbad; for O-type stars (whenever possible) from GOS Catalog (Maíz-Apellániz et al. 2004), otherwise from same reference as in Table 5. For SER 2, 6, and 7 we did not find stars related. Distances: []: derived from Hipparcos parallaxes (van Leeuwen 2007). Wind terminal velocities: inter or extrapolated from Table 3, Prinja et al. (1990); []: as adopted in Peri et al. (2012) for stars with same spectral types. Mass loss rates: inter or extrapolated from Vink et al. (2001). Tangential velocities: for HIP 44368 estimated through proper motion values; for the other sources of groups 3 and 4 from Tetzlaff et al. (2011). Radial velocities: for groups 3 to 6, from Kharchenko et al. (2007); for objects from Group 7, references as in Table 5, and Simbad for SER 1, 3, 4, and 5. Proper motions: for groups 3 to 6, and K3 (HD 195229), from van Leeuwen (2007); for G1 to G8 we show two values from Gvaramadze et al. (2011a); for TYC 3159-6-1, BD −14 5040, and Star 1, reference as in Table 5 (see errors for velocities and proper motions in references); for SER 1, 3, 4, and 5, Simbad.