New radial velocities and further photometric observations of lambda Sco and kappa Sco.

Radial velocity measurements of the southern broad-lined stars A Sco and IC Sco have confirmed their membership in the Canis Majoris (or P Cephei) class of variables. Photometric observations of both stars were made from 1971 to 1973. These observations are investigated in addition to those obtained in 1969 and 1970, reported already in a previous paper. For A Sco they show that neither the period nor the amplitude of the short-period variation are constant; the I c-day period is present in each year's observations. The beat period of 7d.3 for IC Sco is confirmed, although there are significant variations in the amplitudes which are not accounted for by simple beating periods. Three colour observations were made for both stars on three nights in 1972. Both A Sco and IC Sco are binaries, but due to their unknown orbital parameters it has not been possible to attribute departures from periodic behaviour to the effects of the secondary.