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HD 69765


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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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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Ucan Balik
Sað Açýklýk:08h11m33.20s
Yükselim:-74°59'57.1"
Görünürdeki Parlaklýk:8.309
Uzaklýk:171.233 parsek
özdevim Sað Açýklýk:14.4
özdevim Yükselim:-21.6
B-T magnitude:8.67
V-T magnitude:8.339

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 69765
TYCHO-2 2000TYC 9205-372-1
USNO-A2.0USNO-A2 0150-05189018
HIPHIP 40108

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