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Paper: The Spectropolarimetric Evolution of V838 Monocerotis
Volume: 363, The Nature of V838 Mon and its Light Echo
Page: 73
Authors: Wisniewski, J.P.
Abstract: I review photo-polarimetric and spectropolarimetric observations of V838 Mon, which revealed that it had an asymmetrical inner circumstellar envelope following its second photometric outburst. Electron scattering, modified by pre- or post-scattering H absorption, is the polarizing mechanism in V838 Monís envelope. The simplest geometry implied by these observations is that of a spheroidal shell, flattened by at least 10% and having a projected position angle on the sky of ~37°. Analysis of V838 Monís polarized flux reveals that this electron scattering shell lies interior to the envelope region in which Hα and Ca II triplet emission originates. To date, none of the theoretical models proposed for V838 Mon have demonstrated that they can reproduce the evolution of V838 Monís inner circumstellar environment, as probed by spectropolarimetry.
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