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HD 131782


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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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Observation and Astrometry data

Constellation:Circinus
Right ascension:14h58m44.94s
Declination:-65°00'13.6"
Apparent magnitude:7.961
Distance:124.378 parsecs
Proper motion RA:-32.2
Proper motion Dec:-27.9
B-T magnitude:8.225
V-T magnitude:7.983

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 131782
TYCHO-2 2000TYC 9028-937-1
USNO-A2.0USNO-A2 0225-21372086
HIPHIP 73295

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