Detection of Optical Circular Polarization in the Herbig Ae Star WW Vul

Details Detection of Optical Circular Polarization in the Herbig Ae Star WW Vul Detection of Optical Circular Polarization in the Herbig Ae Star WW Vul

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27..376s&link_type=abstract

Astronomy Letters, vol. 27, p. 376-378 (2001)

Astronomy and Astrophysics

Astronomy

Young Stars, Polarization

Scientific paper

UBVRI observations of circular polarization in WW Vul are presented. A positive polarization of ~0.1% was detected with a signal-to-noise ratio from 3 to 5 in each of the bands and more than 5 when averaged over all five bands. This observed polarization roughly corresponds to a 1% circular polarization of the radiation scattered in a circumstellar disk, which is most likely attributable to the significant alignment of scattering nonspherical dust grains. Since grain alignment is possible only in a magnetic field, this result provides circumstantial evidence for the existence of a magnetic field in the circumstellar disk of WW Vul.

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