A study of polarized spectra of magnetic CP stars: Predicted vs. observed Stokes IQUV profiles for $\beta$ CrB and 53 Cam

摘要: We present a comparison of observed and calculated Stokes IQUV spectra two well-known magnetic chemically peculiar stars, Coronae Borealis 53 Camelopardalis. The were recently described by Wade et al. (2000a), have been complemented with additional circularly polarized obtained at the Special Astrophysical Observatory. represent predictions new previously published eld models derived from analysis some surface averaged estimates (e.g., longitudinal eld, modulus, etc.). nd that these are not sucient to account fully for proles { particularly remarkable is disagreement between predicted StokesQ U Cam. suggest this should be interpreted in terms morphologies which signicantly more complex than second-order multipolar expansions assumed models. However, it clear our inability reproduce detailed shapes unrelated For many metallic ions, both we found impossible strengths spectral line when adopted unique value individual ion abundance. results strongly non-uniform distributions ions as function optical depth (i.e., chemical stratication), hypothesis supported simple stratied