Contingut
Imatges
Carregar la teva Imatge
DSS Images Other Images
Articles Relacionats
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.
|
Enviar un nou article
Enllaços Relacionats
- - No s'ha trobat enllaços -
Enviar un nou enllaç
Membre dels grups següents:
|
Dades d'Observació i Astrometria
| Constel·lació: | Telescopium |
| Ascensió Recta: | 18h17m50.85s |
| Declinació: | -56°28'40.6" |
| Magnitud Aparent: | 7.412 |
| Distancia: | 219.298 parsecs |
| Moviment propi RA: | -3.7 |
| Moviment propi Dec: | 16.1 |
| B-T magnitude: | 7.739 |
| V-T magnitude: | 7.439 |
Catàlegs i designacions:
|
