UV, optical and near-IR diagnostics of massive stars

Abstract

We present an overview of a few spectroscopic diagnostics of massive stars. We explore the following wavelength ranges: UV (1000 to 2000 A), optical (4000--7000 A) and near-infrared (mainly H and K bands). The diagnostics we highlight are available in O and Wolf-Rayet stars as well as in B supergiants. We focus on the following parameters: effective temperature, gravity, surface abundances, luminosity, mass loss rate, terminal velocity, wind clumping, rotation/macroturbulence and surface magnetic field.Comment: 12 pages, 8 figures. Proceedings of the 39th Li\`ege Astrophysical Colloquium "The multi-wavelength view of hot, massive stars". Referee's comments include