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HD 200708


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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.

Interstellar extinction and polarimetric properties of the star HD 200775
Reddening and polarization are obtained and separated into intrinsic andinterstellar components for the Herbig Be star HD 200775, which issurrounded by the NGC 7023 reflection nebula. A reddening map based onstar counts is used to derive the relation between (C-13)O columndensity and extinction, and the maximum interstellar polarization isfound to be 0.88 percent at the maximum wavelength of 0.532 microns;this indicates that the size distribution of the particles in the cloudresponsible for the optical extinction and polarization is rathersimilar to that of the surrounding interstellar medium.

Mikrometermessungen von Doppelsternen. VI.
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Micrometer measures of doubles stars. III.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1963AJ.....68...57V&db_key=AST

Mesures d'étoiles doubles
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Datos observacionales y astrométricos

Constelación:Cefeo
Ascensión Recta:21h01m32.33s
Declinación:+66°42'33.2"
Magnitud Aparente:8.595
Distancia:173.01 parsecs
Movimiento Propio en Ascensión Recta:4.3
Movimiento Propio en Declinación:-14.8
B-T magnitude:8.939
V-T magnitude:8.624

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 200708
TYCHO-2 2000TYC 4259-196-1
USNO-A2.0USNO-A2 1500-07756649
HIPHIP 103758

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