Detection of additional Wolf-Rayet stars in the starburst cluster   Westerlund 1 with SOAR
  We report the detection of 3 additional Wolf-Rayet stars in the young cluster Westerlund 1. They were selected as emission-line star candidates based on 1 micron narrow-band imaging of the cluster carried out at OPD/LNA (Brazil), and then confirmed as Wolf-Rayet stars by K-band spectroscopy performed at the 4.1 m SOAR telescope (Chile). Together with previous works, this increases the population of Wolf-Rayet stars detected in the cluster to 22 members. Moreover, it is presented for the first time a K-band spectrum of the luminous blue variable W243, which apparently implies in a higher temperature than that derived from optical spectra taken in 2003. The WC9 star WR-F was also observed, showing clear evidence of dust emission in the K-band. 
J. H. Groh (1,2), A. Damineli (1), M. Teodoro (1) and C. L. Barbosa   (3) ((1) IAG/USP, (2) University of Pittsburgh, (3) IP...