Spectropolarimetric Observations of the Candidate Luminous Blue Variable MWC 314

Details Spectropolarimetric Observations of the Candidate Luminous Blue Variable MWC 314 Spectropolarimetric Observations of the Candidate Luminous Blue Variable MWC 314

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.0713w&link_type=abstract

American Astronomical Society Meeting 204, #07.13; Bulletin of the American Astronomical Society, Vol. 36, p.787

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Scientific paper

Luminous Blue Variables are a subset of supergiant stars which experience violent, massive eruptions. We present the initial results of multi-epoch spectropolarimetric observations, using the University of Wisconsin-Madison HPOL spectropolarimeter, of MWC 314, whose stellar evolutionary phase has been suggested to be a precursor to a LBV. Significant line polarization and continuum polarization variability is observed over the five-year timescale of these observations, indicating the presence of an intrinsic polarization component. While the continuum polarization exhibits variability of up to 1% in magnitude, the position angle remains constant over time. This suggests that MWC 314 is characterized by an asymmetric circumstellar environment, possibly a flattened circumstellar envelope. The circumstellar environment of MWC 314 is compared to those of other known LBVs.
We acknowledge support provided by a NASA LTSA grant (NAG5-8054) and a Research Corporation Cottrell Scholar Award to KSB, and a NASA GSRP fellowship (NGT5-50469) to JPW. HPOL has been partially supported under NASA contract NAS5-26777.

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