Table 10
Time variability of the spectroscopic indices.
| Hen 4- | Comment | σ(V) (mag) | Spectrograph | Date | BTiO | BZrO | BNa |
|
|
|||||||
| 147 | extrinsic | 0.03 | HERMES | 18/05/2009 | 0.24 | 0.24 | 0.39 |
| B&C | 24/01/1997 | 0.24 | 0.26 | 0.37 | |||
| Δ | 0.00 | –0.02 | 0.02 | ||||
| 121 | extrinsic | 0.14 | HERMES | 31/05/2009 | 0.45 | 0.34 | 0.52 |
| symbiotic | B&C | 24/01/1997 | 0.41 | 0.34 | 0.45 | ||
| Δ | 0.04 | 0.00 | 0.07 | ||||
| 134 | intrinsic | 0.25 | HERMES | 22/05/2009 | 0.23 | 0.30 | 0.34 |
| semi-regular | B&C | 27/01/1997 | 0.33 | 0.26 | 0.39 | ||
| Δ | -0.10 | 0.04 | -0.05 | ||||
| 125 | intrinsic | 1.46 | HERMES | 28/05/2009 | 0.30 | 0.30 | 0.43 |
| Mira | B&C | 25/01/1997 | 0.56 | 0.36 | 0.68 | ||
| Δ | –0.26 | –0.06 | –0.25 | ||||
Notes. BTiO, BZrO and BNa indices are computed from non-simultaneous HERMES and Boller & Chivens (B&C) spectra. σ(V) represents the standard deviation of the ASAS V magnitude. Δ stands for the difference in band-strength indices between the two observing dates mentioned in the “Date” column.
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