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HD 120230


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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:Cennet Kusu
Sað Açýklýk:13h51m26.68s
Yükselim:-73°08'37.4"
Görünürdeki Parlaklýk:7.109
Uzaklýk:78.555 parsek
özdevim Sað Açýklýk:36.1
özdevim Yükselim:-8.5
B-T magnitude:7.445
V-T magnitude:7.137

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 120230
TYCHO-2 2000TYC 9255-1899-1
USNO-A2.0USNO-A2 0150-12403499
HIPHIP 67630

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