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HD 50198


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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:繪架座
右阿森松:06h48m35.93s
赤纬:-58°28'02.3"
视星:8.288
距离:136.426 天文距离
右阿森松适当运动:-7.4
赤纬适当运动:6.9
B-T magnitude:8.626
V-T magnitude:8.316

目录:
适当名称   (Edit)
HD 1989HD 50198
TYCHO-2 2000TYC 8548-1257-1
USNO-A2.0USNO-A2 0300-02446590
HIPHIP 32643

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