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Classification of Population II supergiants and related stars in the Vilnius system
The results of photometric classification in the Vilnius system of 117Population II supergiants, suspected supergiants, and related stars aregiven. Their photometric spectral types, intrinsic color indices (Y-V)0,color excesses E(Y-V), metallicities Fe/H, and absolute magnitudes MVare determined. It is shown that the system allows us to detect the UUHerculis-type supergiants photometrically. The analyzed SRd star samplefalls into two groups of metallicity and luminosity. Our photometricclassification assigns luminosity classes from III to V to 37 F-K starswith /b/ greater than 16 deg classified by Bartaya (1979) from objectiveprism spectra as supergiants.
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Osservazione e dati astrometrici
| Costellazione: | Orsa Maggiore |
| Ascensione retta: | 09h37m55.99s |
| Declinazione: | +44°13'08.6" |
| Magnitudine apparente: | 8.298 |
| Distanza: | 386.1 parsec |
| Moto proprio RA: | -1.6 |
| Moto proprio Dec: | -5.1 |
| B-T magnitude: | 10.22 |
| V-T magnitude: | 8.457 |
Cataloghi e designazioni:
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