Table 1
Interferometric calibrators used for the PIONIER observations of Achernar.
| Name | Sp. type | m V | m H | m K | ⌀LD (mas) | ⌀UD (mas) | Ref. code |
|
|
|||||||
| HD 6793 | G5III | 5.34 | 3.25 | 3.24 | 1.08 ± 0.08 | 1.06 ± 0.08 | B06 |
| HD 9362 | K0IIIb | 3.95 | 1.75 | 1.65 | 2.24 ± 0.02 | 2.17 ± 0.02 | B02 |
| HD 12524 | K5III | 5.16 | 1.69 | 1.52 | 2.77 ± 0.03 | 2.67 ± 0.03 | B02 |
| HD 187691 | F8V | 5.12 | 3.86 | 3.90 | 0.72 ± 0.05 | 0.70 ± 0.05 | B06 |
| HD 216956 | A4V | 1.16 | 1.05 | 1.05 | 2.22 ± 0.02 | 2.20 ± 0.03 | A09 |
| HD 14641 | K5III | 5.82 | 2.19 | 2.02 | 2.20 ± 0.03 | 2.12 ± 0.02 | B02 |
Notes.VHK magnitudes are given, as well as limb-darkened (LD) and uniform-disk (UD) angular diameters. The references are B02: Bordé et al. (2002), B06: Bonneau et al. (2006), A09: Absil et al. (2009). The interferometric signature of fast-rotation and debris disk of HD 216956 is significantly below the observational uncertainties so that this star was used as a suitable calibrator.
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