The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500

  title={The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500},
  author={A. Sota and Jes'us Ma'iz Apell'aniz and Nolan R. Walborn and Emilio J. Alfaro and Rodolfo H. Barb'a and Nidia I. Morrell and R. C. Gamen and Julia I Arias},
  journal={arXiv: Astrophysics of Galaxies},
We present the first installment of a massive spectroscopic survey of Galactic O stars, based on new, high signal-to-noise ratio, R~2500 digital observations from both hemispheres selected from the Galactic O-Star Catalog of Ma\'iz Apell\'aniz et al. (2004) and Sota et al. (2008). The spectral classification system is rediscussed and a new atlas is presented, which supersedes previous versions. Extensive sequences of exceptional objects are given, including types Ofc, ON/OC, Onfp, Of?p, Oe, and… 

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