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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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Observation and Astrometry data
| Constellation: | Αετός |
| Right ascension: | 20h05m20.34s |
| Declination: | +00°27'16.2" |
| Apparent magnitude: | 6.933 |
| Distance: | 6250 parsecs |
| Proper motion RA: | 4.5 |
| Proper motion Dec: | -8.9 |
| B-T magnitude: | 6.972 |
| V-T magnitude: | 6.937 |
Catalogs and designations:
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