A study of the wavelength dependence of interstellar polarization using a scanning spectropolarimeter |
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| Authors: | R D Wolstencroft K Nandy |
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| Institution: | (1) Royal Observatory, Edinburgh, Scotland |
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| Abstract: | A scanning spectropolarimeter has been constructed and used in a preliminary search for conspicuous features of the interstellar polarization curve between
–1 = 1.58
–1 and 2.50
–1. The instrument was used at thef/4.5 prime focus of the 36 telescope of the Cambridge University Observatories. Scans were made on HD2905, HD21389,  And and  Tau with slitwidths of 50 Å and 100 Å.The commonly adopted method of correcting for instrumental polarisation by using observations of unpolarized stars has been applied. The normalized polarization curves corrected for instrumental polarization for HD2905 and HD21389 reveal a feature near
–1 = 1.68
–1 which is most probably of insterstellar rather than instrumental origin. |
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