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HD 161218


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The chemical evolution of the solar neighborhood. I - A bias-free reduction technique and data sample
The possible ways of measuring the age-metallicity relation for thegalactic disk in the neighborhood of the sun are discussed. It is shownthat the use of a field star sample chosen on the basis of effectivetemperature introduces a bias which results in a monotonic increase inthe metal abundance of the disk with time. However, if theage-metallicity relation for the disk can be shown to satisfy certaincriteria, the bias introduced in such a sample can be neglected: thegalactic disk apparently satisfies the criteria. It is concluded that asample analyzed through the use of uvby and H(beta) photometry inconjunction with a self-consistent set of theoretical isochronesprovides the least biased, most accurate estimate of the age-metallicityrelation for the disk.

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观测天体数据

星座:天壇座
右阿森松:17h47m32.85s
赤纬:-56°09'57.5"
视星:7.369
距离:89.928 天文距离
右阿森松适当运动:7.1
赤纬适当运动:-8.5
B-T magnitude:7.824
V-T magnitude:7.407

目录:
适当名称   (Edit)
HD 1989HD 161218
TYCHO-2 2000TYC 8746-2721-1
USNO-A2.0USNO-A2 0300-32655084
HIPHIP 87070

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