A new calibration of stellar parameters of Galactic O stars

We present new calibrations of stellar parameters of O stars at solar metallicity taking non-LTE, wind, and line-blanketing effects into account. Gravities and absolute visual magnitudes are derived from results of recent spectroscopic analyses. Two types of effective temperature scales are derived: one from a compilation based on recent spectroscopic studies of a sample of massive stars – the “observational scale” – and the other from direct interpolations on a grid of non-LTE spherically extended line-blanketed models computed with the code CMFGEN (Hillier & Miller 1998) – the “theoretical scale”. These Teff scales are then further used together with the grid of models to calibrate other parameters…

• NS
  National Science Foundation
• NA
  National Aeronautics and Space Administration
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
• FD
  Fonds De La Recherche Scientifique - FNRS