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HD 219621


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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:杜鵑座
右阿森松:23h17m54.48s
赤纬:-60°59'53.3"
视星:8.135
距离:130.378 天文距离
右阿森松适当运动:-4.1
赤纬适当运动:5.3
B-T magnitude:8.536
V-T magnitude:8.169

目录:
适当名称   (Edit)
HD 1989HD 219621
TYCHO-2 2000TYC 9126-2030-1
USNO-A2.0USNO-A2 0225-31791003
HIPHIP 115034

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