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HD 18503


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Visual polarization measurements in the Cepheus flare
We present polarization measurements on a stellar sample located in alarge area in Cepheus. The observations were made with the 2-m telescopeat the Pic du Midi (France), around 4350 A and with an accuracy of thepolarization degree of the order of 0.0001. At large scales, we findthat the galactic magnetic field as given by the direction of thepolarization (alignment of the dust) is, roughly speaking, parallel tothe galactic plane in the Cassiopeia cloud, with a scale size of theorder of 100 pc, while it is turned by about 90 in the Cepheus cloud. Atsmall scales, in both the Cepheus and the Cassiopeia clouds, the COcontent has little correlation with the degree of polarization.

Photographic magnitudes of stars brighter than 7m.75 between +75° and +80° declination (Errata: 11 270)
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Yerkes actinometry. Zone +73deg to +90deg.
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Observation and Astrometry data

Constellation:Cassiopeia
Right ascension:03h04m17.01s
Declination:+75°08'58.4"
Apparent magnitude:7.148
Distance:253.165 parsecs
Proper motion RA:9
Proper motion Dec:-4
B-T magnitude:7.126
V-T magnitude:7.147

Catalogs and designations:
Proper Names
HD 1989HD 18503
TYCHO-2 2000TYC 4508-320-1
USNO-A2.0USNO-A2 1650-00594621
HIPHIP 14295

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