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HD 203497


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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:印第安座
右阿森松:21h24m45.85s
赤纬:-57°15'25.9"
视星:7.188
距离:254.453 天文距离
右阿森松适当运动:37.2
赤纬适当运动:-48.6
B-T magnitude:7.445
V-T magnitude:7.21

目录:
适当名称   (Edit)
HD 1989HD 203497
TYCHO-2 2000TYC 8814-731-1
USNO-A2.0USNO-A2 0300-37186283
HIPHIP 105719

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