The Catalog of Proper Motions
and Line-of-sight Velocities of
OB Associations

Notation

name - the name of OB-association from C.Blaha and R.M.Humphreys list (1989);
l (deg.) - the mean Galactic Longitude;
b (deg.) - the mean Galactic Latitude;
r_ph (kpc) - the mean photometric distance from the Sun to the OB association, which equals r=0.8 rBH, where rBH is the mean heliocentric distance from Blaha and Humphreys' catalog (1989), for more details see e.g. Dambis et al. (2001);
r_tg (kpc) - the trigonometric distance to the OB association derived from Gaia DR2 parallaxes and corrected for -0.110 mas, par_tg=par_gaia_dr2+0.110 mas (Melnik & Dambis 2020);
mul (mas/year) - the median proper motion along Galactic Longitude of the stars of the OB-association;
eml (mas/year) - the uncertainty in mul;
mub (mas/year) - the median proper motion along Galactic Latitude of the stars of the OB-association;
emb (mas/year) - the uncertainty in mub;
n_mu - the number of stars in the OB-association with known Gaia DR2 proper motions and errors RUWE<1.4
Vr (km/s) - the median line-of-sight velocity of the stars of the OB-association, km/s ;
evr (km/s) - the error in Vr;
n_vr - the number of stars in the OB-association with known line-of-sight velocitiy, which were taken from the catalog of M.Barbier-Brossat and P.Figon (2000); only velocities with estimation errors less than 10 km s-1 were taken into account;
The CATALOG is related to the paper by Melnik & Dambis (Ap&SS 365:112, 2020)

THE CATALOG