Optical Polarization of X Per

Details Optical Polarization of X Per Optical Polarization of X Per

May 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972natur.237...29b&link_type=abstract

Nature, Volume 237, Issue 5349, pp. 29-30 (1972).

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Scientific paper

IT has been suggested that the variable star X Per may be the X-ray source 2ASE 0352 + 30 (refs. 1 and 2, and R. J. Brucato and J. Kristian, personal communication). Nikulin et al.3 report strong and variable circular polarization of Sco X-1 and HD 226868 (the possible optical counterpart of Cyg X-1), so the polarization of X Per (and its variation) is of interest. One of us (J. T., unpublished thesis) has recently developed a wideband polarization modulator of the Dollfus type4,5. A prototype using plastic retarders was used on a 30-cm Cassegrain reflector to observe the polarization of nearby bright stars, and of ζ Per and X Per. The observations on bright stars and on ζ Per show that instrumental polarization (linear or circular) is certainly less than 0.02% of the total intensity, even in the presence of several % of total intensity in polarization forms other than that being measured. Our bandwidth of approximately 1000 Å is centred between 5000 Å and 5500 Å.

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