TY - JOUR T1 - A VLT/FLAMES survey for massive binaries in Westerlund 1 I. First observations of luminous evolved stars JO - ASTRON ASTROPHYS PY - 2009/12/01 AU - Ritchie BW AU - Clark JS AU - Negueruela I AU - Crowther PA ED - DO - DOI: 10.1051/0004-6361/200912686 VL - 507 IS - 3 SP - 1585 EP - 1595 Y2 - 2024/12/23 ER -