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HD 94275


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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:Carena
Ascensione retta:10h51m46.88s
Declinazione:-57°16'20.3"
Magnitudine apparente:6.291
Distanza:185.185 parsec
Moto proprio RA:-51.2
Moto proprio Dec:1.4
B-T magnitude:6.56
V-T magnitude:6.314

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 94275
TYCHO-2 2000TYC 8622-1471-1
USNO-A2.0USNO-A2 0300-10823412
HIPHIP 53100

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