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HD 127202


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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:Compasso
Ascensione retta:14h33m14.21s
Declinazione:-67°11'15.4"
Magnitudine apparente:7.582
Distanza:168.35 parsec
Moto proprio RA:-39.5
Moto proprio Dec:-36.1
B-T magnitude:8.034
V-T magnitude:7.62

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 127202
TYCHO-2 2000TYC 9018-229-1
USNO-A2.0USNO-A2 0225-20405779
HIPHIP 71159

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