We have observed 49 X-ray detected bright late B-type dwarfs to search for close low-mass pre-main sequence ( PMS ) companions using the European Southern Observatory ’ s ADONIS ( Adaptive Optics Near Infrared System ) instrument .
We announce the discovery of 21 new companions in 9 binaries , 5 triple , 4 quadruple system and 1 system consisting of five stars .
The detected new companions have K magnitudes between 6 ^ { m } . 5 and 17 ^ { m } . 3 and angular separations ranging from 0.″2 and 14.″1 ( 18-2358 AU ) .