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• W2514183506 startingPage "39" @default.
• W2514183506 abstract "We present spectra of the extreme polar AR Ursae Majoris (AR UMa), which display a clear Al i absorption doublet, alongside spectra taken less than a year earlier in which that feature is not present. Re-examination of earlier SDSS spectra indicates that the Al i absorption doublet was also present ≈8 years before our first non-detection. We conclude that this absorbing material is unlikely to be on the surface of either the white dwarf (WD) or the donor star. We suggest that this Al i absorption feature arises in circumstellar material, perhaps produced by the evaporation of asteroids as they approach the hot WD. The presence of any remaining reservoir of rocky material in AR UMa might help to constrain the prior evolution of this unusual binary system. We also apply spectral decomposition to find the stellar parameters of the M dwarf companion, and attempt to dynamically measure the mass of the WD in AR UMa by considering both the radial velocity curves of the Hβ emission line and the Na i absorption line. Thereby we infer a mass range for the WD in AR UMa of 0.91 M⊙ < MWD < 1.24 M⊙." @default.
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• W2514183506 date "2016-08-26" @default.
• W2514183506 modified "2023-09-26" @default.
• W2514183506 title "TIME-VARIABLE ALUMINUM ABSORPTION IN THE POLAR AR URSAE MAJORIS, AND AN UPDATED ESTIMATE FOR THE MASS OF THE WHITE DWARF" @default.
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• W2514183506 doi "https://doi.org/10.3847/0004-637x/828/1/39" @default.
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