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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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| Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.
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Osservazione e dati astrometrici
| Costellazione: | Dragone |
| Ascensione retta: | 17h18m54.73s |
| Declinazione: | +63°43'21.8" |
| Magnitudine apparente: | 7.326 |
| Distanza: | 258.398 parsec |
| Moto proprio RA: | -2.7 |
| Moto proprio Dec: | 5.6 |
| B-T magnitude: | 7.39 |
| V-T magnitude: | 7.332 |
Cataloghi e designazioni:
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