CCD observations of bipolar nebulae. II - LK H-alpha 233

Details CCD observations of bipolar nebulae. II - LK H-alpha 233 CCD observations of bipolar nebulae. II - LK H-alpha 233

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..220a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 220-226.

Astronomy and Astrophysics

Astrophysics

33

Astronomical Photometry, H Alpha Line, Nebulae, Polarimetry, Stellar Spectra, Charge Coupled Devices, Cosmic Dust, Linear Polarization

Scientific paper

Imaging polarimetry and photometry in three colours (B,V, and R) are presented of the emission star/nebula Lick Hα 233. These new observations were made with the Royal Observatory, Edinburgh CCD Imaging Spectropolarimeter and have a pixel resolution of ≡0arcsec.5. The polarization maps clearly reveal a large disk or torus surrounding the central star and show that the associated faint nebulosity (or lobes) is part of the system. These "bipolar" type lobes are highly polarized indicative of an optically-thin reflection nebula. Polarization mapping is shown to be a powerful tool in detecting disks and bipolar lobes. The authors also discuss the origin of the large visual extinction towards LkHα 233 and conclude that an intrinsic component of extinction must be present.

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