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Table 2
Parameters of the calibrators for VX Sgr extracted from Cruzalèbes et al. (2019) (left) and stellar parameters of the synthetic spectra (PHOENIX grid, Husser et al. 2013) used for the calibrators (see text): effective temperature (Teff), surface gravity (log g), and metallicity [Fe∕H] (right).
| Name | Spectral type | LDD (a) diameter | Teff | log g | [Fe∕H] |
|---|---|---|---|---|---|
| (mas) | (K) | (cgs) | |||
| HD 163917 (ν Oph) | G9IIIa | 2.789 ± 0.005 | 5100 | 2.5 | +0.5 |
| HD 188603 (β Sgr) | K2.5IIb | 2.895 ± 0.013 | 4200 | 1.0 | +0.5 |
| HD 168454 (δ Sgr) | K2.5IIIa | 5.874 ± 0.026 | 4600 | 1.5 | +0.5 |
| HD 140573 (α Ser) | K2IIIb | 4.770 ± 0.013 | 4200 | 3.0 | 0.0 |
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