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HD 134403


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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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Osservazione e dati astrometrici

Costellazione:Uccello del Paradiso
Ascensione retta:15h14m12.85s
Declinazione:-70°33'33.3"
Magnitudine apparente:7.626
Distanza:123.457 parsec
Moto proprio RA:13.9
Moto proprio Dec:2.7
B-T magnitude:7.975
V-T magnitude:7.655

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 134403
TYCHO-2 2000TYC 9263-912-1
USNO-A2.0USNO-A2 0150-14651449
HIPHIP 74574

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