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Browsing by Author "McCall, A."
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Circular Polarization in Star- Formation Regions : Implications for Biomolecular Homochirality
Bailey, J.; Chrysostomou, A.; Hough, J.; Gledhill, T.; McCall, A.; Clark, S.; Menard, F.; Tamura, M. (1998)Strong infrared circular polarization resulting from dust scattering in reflection nebulae in the Orion OMC-1 star-formation region has been observed. Circular polarization at shorter wavelengths might have been important ... -
Hatfield near-infrared polarimeter
Cox, L.J.; Hough, J.; McCall, A. (1978)The design of the Hatfield Polytechnic Observatory's near-infrared (IJHKLM) polarimeter is described and its performance iliustrated by some representative observations on bright standard stars. Preliminary measurements ... -
Linear polarization of galactic center in near infrared
Hough, J.; McCall, A.; Adams, D.J.; Jameson, R.F. (1978) -
Linear polarization of T-Tauri stars
Hough, J.; Bailey, J.; Cunningham, E.C.; McCall, A. (1981)Linear polarization observations over the wavelength range 0.44-2.2 microns are presented for six T Tauri type stars. All of the stars studied show substantial polarization in the infrared, while T Tau itself (and probably ... -
Magnetic fields in discs : what can be learned from infrared and mm polarimetry ?
Aitken, D.; Efstathiou, A.; McCall, A.; Hough, J. (2002)Polarimetric imaging in the infrared and submm offers the possibility of identifying magnetic field configurations in astronomical objects. To test this conjecture a set of field geometries within internally heated discs ... -
A Model for the Infrared Polarization of NGC 1068
Efstathiou, A.; Hough, J.; McCall, A.; Young, S. (Astronomical Society of the Pacific, 1996)We present a method for calculating the polarization due to absorption and emission by aligned grains distributed in a disk or a torus. The temperature distribution in the torus is calculated self-consistently with the ... -
Near Infrared Imaging Polarimetry of Proto-Planetary Nebula - OH231.8+4.2
Ahmad, A.; Gledhill, T.; McCall, A.; Takami, M. (Astronomical Society of the Pacific, 2002) -
Near-infrared imaging polarimetry of bipolar nebulae 1:the BN-KL region of OMC-1
Minchin, N.R.; Hough, J.; McCall, A.; Burton, M.; McCaughrean, M.J.; Aspin, C.; Bailey, J.; Axon, D.J.; Sato, S. (1991)New high-spatial-resolution polarization images of the BN-KL region of OMC-1 from 1.25-3.6 microns are presented. At the longer wavelengths these show a centro-symmetric polarization vector pattern, centered mainly on IRc2, ... -
Near-infrared imaging polarimetry of bipolar nebulae. 3: R-Mon/NGC-2261
Minchin, N.R.; Hough, J.; McCall, A.; Aspin, C.; Yamashita, T.; Burton, M. (1991)High-spatial-resolution polarization vector maps of NGC 2261 at J, H and K show a centrosymmetric pattern, suggesting that it is a near-infrared reflection nebula, illuminated by R Mon. Evidence indicates that R Mon is ... -
Polarization due to dichroic absorption and emission by aligned grains in dusty discs
Efstathiou, A.; McCall, A.; Hough, J. (1997)We present a method for calculating the infrared polarization due to absorption and emission by aligned grains distributed in a disc or a torus. The temperature distribution in the torus is calculated with the axially ... -
Spectropolarimetry of the 3-μm water-ice feature towards young stellar objects
Holloway, R.P.; Chrysostomou, A.; Aitken, D.; Hough, J.; McCall, A. (2002)We present spectropolarimetry of the 3-μm water-ice feature towards five young stellar objects embedded in molecular clouds, including the Becklin–Neugebauer object, with wavelength range and spectral resolution much ... -
UV Circular Polarisation in Star Formation Regions : The Origin of Homochirality?
Lucas, P.W.; Hough, J.; Bailey, J.; Chrysostomou, A.; Gledhill, T.; McCall, A. (2005-02)Ultraviolet circularly polarised light has been suggested as the initial cause of the homochirality of organic molecules in terrestrial organisms, via enantiomeric selection of prebiotic molecules by asymmetric photolysis. ...