Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253...63r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 1, 1991, p. 63-68. Research supported by SERC
Astronomy and Astrophysics
Astronomy
2
Astronomical Polarimetry, Infrared Sources (Astronomy), Molecular Clouds, Nebulae, Spatial Resolution, Charge Coupled Devices, H Ii Regions, Herbig-Haro Objects, Interstellar Extinction, Optical Polarization, Stellar Envelopes
Scientific paper
A high spatial resolution optical polarization map of the nebulosity close to the IR source GL2591 is presented which shows that the pattern of vectors is significantly affected by dichroic extinction within the molecular cloud in which the system is located. After correction for these effects it is found that the dominant illuminator of the nebulosity is the IR source GL2591, but there is also a significant localized contribution from a visible star which may be embedded within the cloud. The contribution of this secondary source to the illumination of the nebula at IR wavelengths is negligible. The polarization of the nebula and nearby stars due to dichroic extinction within the cloud suggests that the region may be threaded by a locally uniform magnetic field whose direction is approximately perpendicular to the plane of the circumstellar disk surrounding GL2591.
Rolph C. D.
Scarrott S. M.
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