The VLT-FLAMES survey of massive stars: stellar parameters and rotational velocities in NGC 3293, NGC 4755 and NGC 6611

@article{Dufton2006TheVS,
  title={The VLT-FLAMES survey of massive stars: stellar parameters and rotational velocities in NGC 3293, NGC 4755 and NGC 6611},
  author={Philip L. Dufton and S. J. Smartt and J. K. Lee and R. S. I. Ryans and Ian Hunter and C. J. Evans and Artemio Herrero and Carrie Trundle and Daniel J. Lennon and Michael J. Irwin and A. Kaufer},
  journal={Astronomy and Astrophysics},
  year={2006},
  volume={457},
  pages={265-280}
}
An analysis is presented of VLT-FLAMES spectroscopy for three Galactic clusters, NGC 3293, NGC 4755 and NGC 6611. Non-LTE model atmosphere calculations have been used to estimate effective temperatures (from either the helium spectrum or the silicon ionization equilibrium) and gravities (from the hydrogen spectrum). Projected rotational velocities have been deduced from the helium spectrum (for fast and moderate rotators) or the metal line spectrum (for slow rotators). The origin of the low… 
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