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HD 177853


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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:Ταώς
Right ascension:19h10m49.41s
Declination:-64°59'27.3"
Apparent magnitude:7.956
Distance:190.84 parsecs
Proper motion RA:15.4
Proper motion Dec:-54.8
B-T magnitude:8.214
V-T magnitude:7.978

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 177853
TYCHO-2 2000TYC 9079-622-1
USNO-A2.0USNO-A2 0225-29907316
HIPHIP 94219

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