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        Ha spectropolarimetry of B[e] and Herbig Be stars

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        901423.pdf (PDF, 626Kb)
        Author
        Oudmaijer, R.D.
        Drew, J.E.
        Attention
        2299/1319
        Abstract
        We present the results of medium resolution ( v 60 km s−1) spectropolarimetric observations across H of a sample of B[e] and Herbig Be objects. A change in linear polarization across H is detected in a large fraction of the objects, with characteristics ranging from simple depolarization in a couple of Herbig Be stars, to more complex behaviour in the probable post main sequence B[e] stars. H in the spectra of HD 37806 and HD 50138 each consist of a double-peaked polarized line and a superposed unpolarized single emission peak, suggesting two distinct line-forming regions.Multiple observations of HD 45677 allow for the separation of electron and dust scattering effects for the first time: the difference between derived intrinsic polarization angles of the two components indicate that the dust-scattering region is clumpy. Two unexpected results are the non-detections of H polarization changes in ! Ori, where depolarization has previously been detected, and in MWC 297, which exhibits source elongation at radio wavelengths. In ! Ori time variability is probably responsible such that this star’s electron-scattering disk was much weakened at the time of observation. Two hypotheses are advanced that might explain the MWC 297 result.
        Publication date
        1999
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1046/j.1365-8711.1999.02383.x
        Other links
        http://hdl.handle.net/2299/1319
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