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HD 197701


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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:天鵝座
右阿森松:20h44m13.00s
赤纬:+35°32'12.4"
视星:8.995
右阿森松适当运动:-8.8
赤纬适当运动:-11.9
B-T magnitude:9.114
V-T magnitude:9.005

目录:
适当名称   (Edit)
HD 1989HD 197701
TYCHO-2 2000TYC 2695-409-1
USNO-A2.0USNO-A2 1200-15789073
HIPHIP 102347

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