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Table 1
Sample of stars studied in this work with spectral types taken from the Hipparcos database.
| Star | Cluster | Instrument | Spectral | sn | Ref. |
| HD | type | ||||
|
|
|||||
| 5737 | HARPS | B7p, He-wk | Y | R3 | |
| 21071 | Melotte 20 675 | ELODIE | B7V | Y | R1, R2 |
| 23950 | M45 3325 | ELODIE | B8, HgMn | Y | R1, R2 |
| 74146 | IC 2391 16 | HARPS | B4IV | (Y) | R2 |
| 162586 | NGC 6475 56 | HARPS | B8V | Y | R1, R2 |
| 162630 | NGC 6475 63 | UVES | B9III | N | R1 |
| 162678 | NGC 6475 141 | HARPS | B9V | Y | R1, R2 |
| 162679 | NGC 6475 77 | HARPS | B9V | Y | R1, R2 |
| 162817 | NGC 6475 110 | UVES | B9.5V | N | R1 |
Reference. R1 (Abt 1979), R2 (Mermilliod 1983), R3 (Shore et al. 1987).
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