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Emission line spectropolarimetry and circumstellar structures

Published online by Cambridge University Press:  24 July 2015

Jorick S. Vink
Jorick S. Vink*
Affiliation:
Armagh Observatory, College Hill, BT61 9DG Armagh, UK email: [email protected]
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Abstract

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We discuss the role of linear emission-line polarimetry in a wide set of stellar environments, involving the accretion disks around young pre-main sequence stars, to the aspherical outflows from O stars, luminous blue variables and Wolf-Rayet stars, just prior to explosion as a supernova or a gamma-ray burst. We predict subtle QU line signatures, such as single/double QU loops for un/disrupted disks. Whilst there is plenty of evidence for single QU loops, suggesting the presence of disrupted disks around young stars, current sensitivity (with S/N of order 1000) is typically not sufficient to allow for quantitative 3D Monte Carlo modeling. However, the detection of our predicted signatures is expected to become feasible with the massive improvement in sensitivity of extremely large mirrors.

Keywords

polarizationscatteringline: profilesstars: emission-lineBestars: mass lossstars: pre–main-sequencestars: formationstars: windsoutflowsstars: rotationstars: Wolf-Rayet
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S305: Polarimetry: From the Sun to Stars and Stellar Environments , December 2014 , pp. 288 - 292
Copyright
Copyright © International Astronomical Union 2015 

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