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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: | Herkules |
| Right ascension: | 18h43m05.18s |
| Declination: | +18°04'40.5" |
| Apparent magnitude: | 8.139 |
| Distance: | 225.225 parsecs |
| Proper motion RA: | -0.1 |
| Proper motion Dec: | -6.1 |
| B-T magnitude: | 8.262 |
| V-T magnitude: | 8.15 |
Catalogs and designations:
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