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HD 203516


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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.

Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.

Photographic magnitudes of stars brighter than 7m.75 between +75° and +80° declination (Errata: 11 270)
Not Available

Yerkes actinometry. Zone +73deg to +90deg.
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观测天体数据

星座:仙王座
右阿森松:21h15m35.69s
赤纬:+78°35'53.6"
视星:7.422
距离:246.305 天文距离
右阿森松适当运动:10.2
赤纬适当运动:8.3
B-T magnitude:7.462
V-T magnitude:7.426

目录:
适当名称   (Edit)
HD 1989HD 203516
TYCHO-2 2000TYC 4590-1236-1
USNO-A2.0USNO-A2 1650-02381496
HIPHIP 104957

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