The Distance to the Massive Galactic Cluster Westerlund 2 from a Spectroscopic and HST Photometric Study

@article{Alvarez2013TheDT,
  title={The Distance to the Massive Galactic Cluster Westerlund 2 from a Spectroscopic and HST Photometric Study},
  author={Carlos A. Vargas Alvarez and Henry A. Kobulnicky and David Bradley and Sheila J. Kannappan and Mark A. Norris and Richard Jacob Cool and Brendan P. Miller},
  journal={The Astronomical Journal},
  year={2013},
  volume={145},
  pages={125}
}
We present a spectroscopic and photometric determination of the distance to the young Galactic open cluster Westerlund 2 using WFPC2 imaging from the Hubble Space Telescope (HST) and ground-based optical spectroscopy. HST imaging in the F336W, F439W, F555W, and F814W filters resolved many sources previously undetected in ground-based observations and yielded photometry for 1136 stars. We identified 15 new O-type stars, along with two probable binary systems, including MSP 188 (O3 + O5.5). We… 
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The extended TeV gamma-ray source HESS J1023-575 is coincident with the massive, young stellar cluster Westerlund 2 (Wd2) and its surrounding H II region RCW 49. On the basis of an analysis of the CO
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GLIMPSE imaging using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope indicates that star formation is ongoing in the RCW 9 giant H II region. A photometric comparison of the sources
Chandra monitoring of the very massive binary WR20a and the young massive cluster Westerlund 2
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We have made CO(J = 2-1) observations toward the H II region RCW 49 and its ionizing source, the rich stellar cluster Westerlund 2, with the NANTEN2 submillimeter telescope. These observations have
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