Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.2903a&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #29.03; Bulletin of the American Astronomical Society, Vol. 26, p.901
Astronomy and Astrophysics
Astronomy
Scientific paper
The results of the ultraviolet interstellar polarization program pursued by the Wisconsin Ultraviolet Photo Polarimeter Experiment (WUPPE) during the 1990 December Astro-1 Spacelab mission were discussed by Clayton et.al. 1992, ApJLett,385,L53. There appear to be atleast three distinctly different wavelength dependencies of the ultraviolet polarization. In some directions the so-called Serkowski law which adequately describes the optical and near infrared polarization continues to do so out to the WUPPE limit of 1400 Angstroms. However, in two cases the UV polarization is distinctly greater than that which would be predicted by extrapolation of the optical/IR Serkowski fit and in one case there is a suggestion of an enhancement of the polarization across the 2175 Angstroms ultraviolet extinction feature. To investigate environmental factors which might be related to these differences we have observed the northern hemisphere examples of each behavior with the Kitt Peak coude feed telescope, echelle grating and T2KA CCD. Of particular interest are the molecular carbon features and the diffuse interstellar bands which show marked differences between the sight lines. These results will be presented and discussed.
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