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HD 191993


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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:Pavo
Right ascension:20h17m09.56s
Declination:-67°27'19.1"
Apparent magnitude:6.724
Distance:71.994 parsecs
Proper motion RA:39.3
Proper motion Dec:-78.7
B-T magnitude:6.977
V-T magnitude:6.745

Catalogs and designations:
Proper Names
HD 1989HD 191993
TYCHO-2 2000TYC 9098-1425-1
USNO-A2.0USNO-A2 0225-30647506
HIPHIP 99994

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