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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.
| Photometry of bright southern cepheids
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970MNRAS.148....1S&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Lupo |
| Ascensione retta: | 14h32m30.98s |
| Declinazione: | -55°27'49.6" |
| Magnitudine apparente: | 7.378 |
| Distanza: | 126.904 parsec |
| Moto proprio RA: | -24.1 |
| Moto proprio Dec: | -3.5 |
| B-T magnitude: | 7.714 |
| V-T magnitude: | 7.406 |
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