Table 3
Fundamental properties of V766 Cen, σ Oph, BM Sco, and HD 206859.
| Parameter | V766 Cen | σ Oph | BM Sco | HD 206859 | Ref. | ||
|
|
|||||||
| fbol (10-9 Wm-2) | 1.68 ± 0.45a | 1.13 ± 0.17 | 0.48 ± 0.07 | 0.89 ± 0.13 | 1 | ||
| d (pc) | 3597 ± 540 | 274 ± 41 | 478 ± 72 | 283 ± 42 | 2 | ||
| L (1031 W) | 26.0 ± 10.4 | 0.10 ± 0.034 | 0.13 ± 0.044 | 0.085 ± 0.029 | 1,2 | ||
| log (L/L⊙) | 5.83 ± 0.40 | 3.42 ± 0.34 | 3.53 ± 0.33 | 3.35 ± 0.33 | – | ||
| θRoss (mas) | 3.86 ± 1.27b | 3.41 ± 0.90 | 2.50 ± 0.35 | 1.86 ± 0.50 | this work | ||
| R (R⊙) | 1492 ± 540 | 100 ± 30 | 129 ± 26 | 57 ± 17 | 2, this work | ||
| Teff (K) | 4287 ± 760 | 4129 ± 566 | 3888 ± 309 | 5274 ± 736 | 1, this work | ||
| log (Teff) | 3.63 ± 0.18 | 3.62 ± 0.14 | 3.59 ± 0.07 | 3.72 ± 0.14 | – | ||
| log (g) | –0.5 ± 0.6 | 1.3 ± 0.5 | 1.1 ± 0.4 | 1.8 ± 0.5 | 4 | ||
| Initial mass Mi (M⊙) | 25–40 | 5–9 | 5–9 | 5–9 | 3 | ||
| Current mass Mc (M⊙) | 13–36 | 5–9 | 5–9 | 5–9 | 3 | ||
Notes. 1: Kharchenko (2001), Cutri et al. (2003), Beichman et al. (1988) – V766 Cen, BM Sco, HD 206859; Moshir et al. (1990) – σ Oph; 2: Humphreys (1978) – V766 Cen; Mermilliod & Paunzen (2003) – BM Sco; Anderson & Francis (2012) – σ Oph, HD 206859; 3: Values obtained by the position of the stars in the HR diagram with the evolutionary tracks from Ekström et al. (2012). 4: Calculated based on the current mass (see below) and radius. We assumed a 15% error each for the flux and distance. The errors in the luminosity, effective temperature, radius, and surface gravity were estimated by error propagation.
The bolometric flux for V766 Cen is that of the primary component alone; it excludes the contribution by the close companion (see Sect. 3.1.1).
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