The Asymmetrical Wind of the Candidate Luminous Blue Variable MWC 314

Details The Asymmetrical Wind of the Candidate Luminous Blue Variable MWC 314 The Asymmetrical Wind of the Candidate Luminous Blue Variable MWC 314

2006-05-23

arxiv.org/abs/astro-ph/0605602v1

Astronomy and Astrophysics

Astrophysics

19 pages, 6 figures, accepted in PASP

Scientific paper

10.1086/506182

We present the results of long-term spectropolarimetric and spectroscopic monitoring of MWC 314, a candidate Luminous Blue Variable star. We detect the first evidence of H$\alpha$ variability in MWC 314, and find no apparent periodicity in this emission. The total R-band polarization is observed to vary between 2.21% and 3.00% at a position angle consistently around $\sim0^{\circ}$, indicating the presence of a time-variable intrinsic polarization component, hence an asymmetrical circumstellar envelope. We find suggestive evidence that MWC 314's intrinsic polarization exhibits a wavelength-independent magnitude varying between 0.09% and 0.58% at a wavelength-independent position angle covering all four quadrants of the Stokes Q-U plane. Electron scattering off of density clumps in MWC 314's wind is considered as the probable mechanism responsible for these variations.

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