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HD 138035


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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:Guney Ucgeni
Sað Açýklýk:15h33m33.94s
Yükselim:-67°20'20.5"
Görünürdeki Parlaklýk:7.853
Uzaklýk:307.692 parsek
özdevim Sað Açýklýk:-16.3
özdevim Yükselim:-10.9
B-T magnitude:8.138
V-T magnitude:7.877

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 138035
TYCHO-2 2000TYC 9034-2416-1
USNO-A2.0USNO-A2 0225-23136568
HIPHIP 76177

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