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HD 2247


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A kinematic and abundance survey at the galactic poles
The DDO intermediate band system is used to obtain detailed informationabout abundance gradients and velocity dispersions in the galaxy, withan emphasis on the properties of halo stars in the range of from 1 to 5kpc. The DDO abundance index is calibrated agianst (Fe/H) for metal-poorstars, with a resulting gradient of about -0.2 per kpc. However, whenthe sample is divided into two subsamples with (Fe/H) less than -0.5 andequal to or greater than -0.5, the gradients are -0.14 and 0.00,respectively. DDO observations of about 1000 stars, mostly G5-K5 giants,show that the velocity dispersion increases both with decrease inmetallicity and increase in z distance. The abundances found for high-zstars are similar to the A-star results of Rodgers (1971) in that abouthalf the K giants above 1 kpc appear to have solar abundances.

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观测天体数据

星座:鯨魚座
右阿森松:00h26m11.42s
赤纬:-21°32'54.9"
视星:9.674
右阿森松适当运动:12
赤纬适当运动:-8.1
B-T magnitude:10.267
V-T magnitude:9.723

目录:
适当名称   (Edit)
HD 1989HD 2247
TYCHO-2 2000TYC 5846-379-1
USNO-A2.0USNO-A2 0675-00169745
HIPHIP 2069

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