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A kinematic and abundance survey at the galactic poles
The DDO intermediate band system is used to obtain detailed informationabout abundance gradients and velocity dispersions in the galaxy, withan emphasis on the properties of halo stars in the range of from 1 to 5kpc. The DDO abundance index is calibrated agianst (Fe/H) for metal-poorstars, with a resulting gradient of about -0.2 per kpc. However, whenthe sample is divided into two subsamples with (Fe/H) less than -0.5 andequal to or greater than -0.5, the gradients are -0.14 and 0.00,respectively. DDO observations of about 1000 stars, mostly G5-K5 giants,show that the velocity dispersion increases both with decrease inmetallicity and increase in z distance. The abundances found for high-zstars are similar to the A-star results of Rodgers (1971) in that abouthalf the K giants above 1 kpc appear to have solar abundances.
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Osservazione e dati astrometrici
| Costellazione: | Balena |
| Ascensione retta: | 00h31m16.48s |
| Declinazione: | -20°56'53.1" |
| Magnitudine apparente: | 10.398 |
| Moto proprio RA: | -7.3 |
| Moto proprio Dec: | -3.4 |
| B-T magnitude: | 11.16 |
| V-T magnitude: | 10.461 |
Cataloghi e designazioni:
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