Linear Spectropolarimetry and the Circumstellar Media of Young and   Massive Stars
  Linear spectropolarimetry is a powerful tool to probe circumstellar structures on spatial scales that cannot yet be achieved through direct imaging. In this review I discuss the role that emission-line polarimetry can play in constraining geometrical and physical properties of a wide range of circumstellar environments, varying from the accretion disks around pre-main sequence T Tauri and Herbig Ae/Be stars, to the issue of stellar wind clumping, and the aspherical outflows from the massive star progenitors of supernovae and long gamma-ray bursts at low metallicity. 
Jorick S. Vink (Armagh Observatory)
astro-ph.SR astro-ph.CO astro-ph.HE