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1999MNRAS.305..166O - Mon. Not. R. Astron. Soc., 305, 166-180 (1999/May-1)
H-alpha spectropolarimetry of B[e] and Herbig Be stars.
OUDMAIJER R.D. and DREW J.E.
Abstract (from CDS):
The general findings are that roughly half of the observed Herbig Be stars show polarization changes across Hα, implying immediately that their ionized envelopes are not spherically symmetric. This pattern, if confirmed by observations of a larger sample, could indicate that the non-detection rate is simply a consequence of sampling randomly oriented circumstellar discs able to scatter starlight within a few stellar radii. The deduced alignment of the disc of HD 53367 with the local interstellar magnetic field suggests an orderly star formation process in which the star `remembers' the larger scale magnetic field direction. The stars classified as B[e] stars all show startling polarization changes across Hα. The details in each case are different, but the widely accepted concept of dense Hα-emitting equatorial discs around these objects is supported.
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): polarization - techniques: polarimetric - circumstellar matter - stars: emission-line, Be - stars: mass-loss - stars: pre-main-sequence
Simbad objects: 21
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