Physical parameters and wind properties of galactic early B supergiants

  title={Physical parameters and wind properties of galactic early B supergiants},
  author={Paul A. Crowther and Daniel J. Lennon and Nolan R. Walborn},
  journal={Astronomy and Astrophysics},
We present optical studies of the physical and wind properties, plus CNO chemical abundances, of 25 O9.5–B3 Galactic supergiants. We employ non-LTE, line blanketed, extended model atmospheres, which provide a modest downward revision in the effective temperature scale of early B supergiants of up to 1-2 kK relative to previous non-blanketed results. The so-called “bistability jump” at B1 ($T_{\rm eff} \sim 21$ kK) from Lamers et al. is rather a more gradual trend (with large scatter) from $v_… 

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