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Photometry of hydrogen deficient stars.
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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: | Γνώμων |
| Right ascension: | 16h30m42.25s |
| Declination: | -59°57'02.4" |
| Apparent magnitude: | 7.62 |
| Distance: | 136.986 parsecs |
| Proper motion RA: | 17 |
| Proper motion Dec: | 15.1 |
| B-T magnitude: | 8.083 |
| V-T magnitude: | 7.659 |
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