An optical polarization study of two possible bipolar nebulae

Details An optical polarization study of two possible bipolar nebulae An optical polarization study of two possible bipolar nebulae

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..505s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 1, 1986, p. 505-511. SERC-supported research.

Astronomy and Astrophysics

Astronomy

13

Astronomical Photometry, Linear Polarization, Nebulae, Optical Polarization, Polarimetry, Bipolarity, Carbon Monoxide, Reflection Nebulae

Scientific paper

Optical linear polarization maps and direct CCD imaging of two objects on a list of possible bipolar and cometary nebulae reveal that object number 3(NS3) is a reflection nebula illuminated by a Herbig Ae/Be star located near the Perseus arm at a distance of 1.6-2.2 kpc. It is sited on the periphery of a dark cloud and, although bipolar in appearance, probably does not have the same structure as typical bipolar nebulae associated with PMS stars. It may be a more evolved system. It is also revealed that object number 14(NS14) is an unusual combination of emission and reflection nebulosity with a single central source that illuminates and excites two inner bright lobes of nebulosity and creates a more distant reflection nebula. The inner dust disk that appears to produce the bipolar structure contains aligned grains, which suggests the presence of a toroidal field within the disk. The central obscured source is considered to be a B0.5V star located at a distance of 3.2 kpc.

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