Stellar groups. II. The Herculis, Indi and 61 Cygni Groups of High-Velocity Stars

A catalogue of 700 high-velocity stars has been searched for objects that share the well-detennined space motions of ζ Herculis (22 stars), ϵ Indi (14 stars) and 61 Cygni (15 stars). The space motions of these groups can be summarized as follows (the Hyades and Sirius Groups of Paper I have been added for comparison): $\begin{matrix}\text{Group}\, \,A \,D \,V_{t} \,U \,V \text{km/sec} \,W\\ h \,m \,^{\circ}\, \, \, \\ \text{Sirius}\, \,20 \,44 \,-42.7 \,18.4 \,-14 \,0 \,-12\\ \text{Hyades} \,6 \,18 \,+ 7.5 \,44.0 \,+40 \,-18 \,-2\\ \zeta \text{Her} \,5 \,48 \,-16.5 \,74.5 \,+54 \,-45 \,-26\\ \epsilon \text{Ind} \,6 \,44\, \,+ 6.7 \,88.5 \,+79 \,-39 \,+6\\ 61 \text{Cyg} \,6 \,28 \,+ 0.3 \,108.0 \,+92 \,-53\, -6\end{matrix}$ where the values of ( A, D ) represent the convergent points of the apparent motions and V _t is the total space velocity of each group with respect to the Sun (the vector space velocities are in the direction l = 148°, b = 0° ; l = 58°, b = 0° ; and b = +90° for U, V, and W respectively). A search through the same catalogue for stars that might be “ members ” of synthetic groups with convergent point at δ = -90° and V _t = 74.5, 88.5, and 108 km/sec indicated that only 2 or 3 chance members are expected to be included in each group. The colour–luminosity array for the stars in all three high-velocity groups is very similar to that for the galactic cluster M 67.