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- W3048209480 abstract "We report on over 13 years of optical and near-ultraviolet spectropolarimetric observations of the famous Luminous Blue Variable (LBV), P Cygni. LBVs are a critical transitional phase in the lives of the most massive stars, and achieve the largest mass-loss rates of any group of stars. Using spectropolarimetry, we are able to learn about the geometry of the near circumstellar environment surrounding P Cygni and gain insights into LBV mass-loss. Using data from the HPOL and WUPPE spectropolarimeters, we estimate the interstellar polarization contribution to P Cygni's spectropolarimetric signal, analyze the variability of the polarization across the H$alpha$ emission line, search for periodic signals in the data, and introduce a statistical method to search for preferred position angles in deviations from spherical symmetry which is novel to astronomy. Our data are consistent with previous findings, showing free-electron scattering off of clumps uniformly distributed around the star. This is complicated, however, by structure in the percent-polarization of the H$alpha$ line and a series of previously undetected periodicities." @default.
- W3048209480 created "2020-08-13" @default.
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- W3048209480 date "2020-09-14" @default.
- W3048209480 modified "2023-09-26" @default.
- W3048209480 title "13 yr of P Cygni Spectropolarimetry: Investigating Mass Loss through Hα, Periodicity, and Ellipticity" @default.
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- W3048209480 doi "https://doi.org/10.3847/1538-4357/abad32" @default.
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