16. A3
The spectral type is determined from the intensity of the blend at
4032 and the ratio
4300:
4385. The luminosity class
depends on the
ratios 4416:
4481,
4175:
4032, and
4226:
4481, and on the
appearance of the wings of the H lines.
| Star | MKK | a |  | m | HD | Notes |
| 38 Lyn.... | A3 V | 09:12 | +37°14' | 3.8 | A2 | |
Leo..... | A3 V | 11:44 | +15 08 | 2.2 | A2 | 1 |
| UMa... | A3 V | 12:10 | +57 35 | 3.4 | A2 | |
Vir....... | A3 V | 13:29 | -00 05 | 3.4 | A2 | |
UMi..... | A3 II-III | 15:20 | +72 11 | 3.1 | A2 | 2 |
| Her..... | A3 IV | 17:10 | +24 57 | 3.2 | A2 | 3 |
| a PsA..... | A3 V | 22:52 | -30 09 | 1.3 | A3 | 4 |
| NOTES | ||||||
| 1. The hydrogen lines are weaker in the spectrum of
Leo
than in the other dwarfs listed.
| ||||||
| 2. The hydrogen lines in UMi are narrower than in the other stars in
the table; the broad wings associated with low luminosity are absent.
| ||||||
| 3. The lines are very broad, and the classification is uncertain. | ||||||
| 4. a PsA gives spectroscopic evidence of having the lowest luminosity of any star in the table. | ||||||
 |
| High resolution image |
