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Population studies. I - The Bidelman-MacConnell 'weak-metal' stars
BRVI and DDO photometry are presented for 309 Bidelman-MacConnell'weak-metal' stars. Radial velocities are calculated for most of thestars having Fe/H abundances of no more than -0.8. The photometricobservations were carried out using the 0.6-meter and 1.0-metertelescopes of the Siding Spring Observatory. Photometric taxonomy wasused to classify the stars as dwarfs, giants, red-horizontal branchstars, and ultraviolet-bright stars, respectively. It is found that 35percent of the stars are giants; 50 percent are dwarfs; and 5 percentbelong to the red-horizontal branch group. The role of selection effectsin investigations of the formation of the Galaxy is discussed on thebasis of the photometric observations and the observational constraintsproposed by Eggen et al. (1962).
| Metal-Deficient Giants in the Galactic Field - Catalogue and Some Physical Parameters
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Osservazione e dati astrometrici
| Costellazione: | Indiano |
| Ascensione retta: | 20h30m28.50s |
| Declinazione: | -45°31'16.5" |
| Magnitudine apparente: | 10.166 |
| Moto proprio RA: | -25.3 |
| Moto proprio Dec: | -43.6 |
| B-T magnitude: | 10.892 |
| V-T magnitude: | 10.226 |
Cataloghi e designazioni:
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