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Toward selection of intermediate-magnitude polarization standards
The Minipol optical polarimeter with a V-band filter was used to observe16 summer intermediate-magnitude (mB = about 9) stars from the survey ofMathewson and Ford (1970). These stars were chosen to span polarizationpercentages from zero to almost 6 percent and to cover a large range ofpolarization position angles. The primary reason for reobserving thesestars was to determine their V-band polarization properties and toidentify polarization variables, which are unsuitable standards. TheMinipol observations showed that 12 of the stars had V-bandpolarizations that were very similar to the Mathewson and Ford B-bandvalues. One star had a significantly different polarization positionangle and two had significantly different percentage polarizations. Onestar, HD 161306, was wildly different in both percentage polarizationand position angle.
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Observation and Astrometry data
| Constellation: | Οφιούχος |
| Right ascension: | 18h04m43.59s |
| Declination: | +00°50'34.3" |
| Apparent magnitude: | 9.536 |
| Proper motion RA: | 6.9 |
| Proper motion Dec: | -17.3 |
| B-T magnitude: | 10.634 |
| V-T magnitude: | 9.627 |
Catalogs and designations:
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