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HD 189089


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Mesures de vitesses radiales. VII. Accompagnement AU sol DU programme d'observation DU satellite Hipparcos. Radial velocities. VII. Ground based measurements for Hipparcos.
We publish 734 radial velocities of stars distributed in 28 fields of4x4deg. We continue the PPO series (Fehrenbach et al. 1987; Duflot etal. 1990 and 1992), using the Fehrenbach objective prism method.

Color excesses of classical cepheids. I
The color excesses of eleven cepheids have been determined with the aidof photometry of field stars found in the proximity of the variables. Acomparison of the color excesses with previous color-excess results isgiven. Four cepheids: RT Aur, DT Cyg, Zeta Gem, and T Vul, haverelatively small and well-established reddening values. These fourstars, along with Alpha UMi, can serve as standards to calibratereddening-free indices with intrinsic color indices such as (b-y) or(B-V).

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观测天体数据

星座:天箭座
右阿森松:19h57m44.06s
赤纬:+17°08'45.3"
视星:7.819
距离:543.478 天文距离
右阿森松适当运动:0.1
赤纬适当运动:-11.9
B-T magnitude:7.791
V-T magnitude:7.817

目录:
适当名称
HD 1989HD 189089
TYCHO-2 2000TYC 1620-1305-1
USNO-A2.0USNO-A2 1050-15814242
HIPHIP 98230
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