Resolving OB Systems in the Carina Nebula with the Hubble Space Telescope Fine Guidance Sensor

@article{Nelan2004ResolvingOS,
  title={Resolving OB Systems in the Carina Nebula with the Hubble Space Telescope Fine Guidance Sensor},
  author={Edmund P. Nelan and Nolan R. Walborn and D. J. Wallace and Anthony F. J. Moffat and Russell B. Makidon and Douglas R. Gies and Nino Panagia},
  journal={The Astronomical Journal},
  year={2004},
  volume={128},
  pages={323-329}
}
We observed 23 OB stars in the Carina Nebula (NGC 3372) with the Hubble Space Telescope's Fine Guidance Sensor 1r (FGS1r) in its high angular resolution mode. Five of these OB stars are newly resolved binaries with projected separations ranging from 0015 to 0352 (37 to 880 AU at a distance of 2.5 kpc), and V-band magnitude differences ranging from 0.9 to 2.8. The most important astrophysical result is the unexpected resolution of the prototype O2 If* star HD 93129A as a 55 milliarcsecond (mas… 
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