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A catalogue of eclipsing variables
A new catalogue of 6330 eclipsing variable stars is presented. Thecatalogue was developed from the General Catalogue of Variable Stars(GCVS) and its textual remarks by including recently publishedinformation about classification of 843 systems and making correspondingcorrections of GCVS data. The catalogue1 represents thelargest list of eclipsing binaries classified from observations.
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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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Miembro de los siguientes grupos:
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Datos observacionales y astrométricos
| Constelación: | Tucán |
| Ascensión Recta: | 23h07m18.94s |
| Declinación: | -60°52'34.8" |
| Magnitud Aparente: | 8.523 |
| Distancia: | 88.889 parsecs |
| Movimiento Propio en Ascensión Recta: | 22 |
| Movimiento Propio en Declinación: | 0.3 |
| B-T magnitude: | 9 |
| V-T magnitude: | 8.563 |
Catálogos y designaciones:
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INHABITED SKY
