Table 1
Parameters of Sun, Vega, and Fomalhaut.
| Star | Sun | Vega | Fomalhaut |
|---|---|---|---|
| Distance | – | 7.76 pc (4) | 7.70 pc (6) |
| Radius | 1 R⊙ = 6.957 × 108 m (1) (0.00465 AU) | 2.818 R⊙ (a) (5) (0.0131 AU (a)) 2.362 R⊙ (b) (5) | 1.842 R⊙ (6) (0.00857 AU) |
| Gravitation constant × Mass | 1 GM⊙ = 1.3271 × 1020 1 ms−2 (1) | 2.135 GM⊙ (5) | 1.92 GM⊙ (6) |
| Rotation speed | 2.86 × 10−6 rad s−1 (c) (2) | 1.20 × 10−4 rad s−1 (a) (5) | 7.76 × 10−5 rad s−1 (a, d) (6) |
| Escape speed (a, d) | 6.1 × 105 m s−1 | 5.4 × 105 m s−1 | 6.3 × 105 m s−1 |
| Age | 4.57 × 109 yr (3) | 455 × 106 yr (4) | 440 × 106 yr (6) |
Notes.The rotation speed of Fomalhaut is only measured projected onto the line of sight. The value in the table is calculated by the assumption that the equator of Fomalhaut lies in the plane of its outer debris disk, which has an inclination of 67° (Su et al. 2013). (a)At equator. (b)At the poles. (c)At 26° latitude. (d) Calculated.
References.(1) IAU (2015); (2) Hakamada & Kojima (1994); (3) Bonanno et al. (2002); (4) Köhler & Mann (2002); (5) Yoon et al. (2010); (6) Mamajek (2012); (7) Díaz et al. (2011).
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