As its name indicates , the Westerlund 2 cluster was discovered by Bengt Westerlund in the sixties ( Westerlund 1961 , PASP , 73 , 51 and 1968 , ApJ , 154 , L67 - see http :\ / \ / vizier.u-strasbg . fr\/cgi-bin\/Dic-Simbad ? Cl % 20Westerlund ) but its stellar content was assessed only in later years ( Moffat et al. 1991 , AJ , 102 , 642 ; Rauw et al. 2007 , A&A , 463 , 981 ) .
As its name indicates , the Westerlund 2 cluster was discovered by Bengt Westerlund in the sixties , but its stellar content was assessed only in later years .