Table 1.
Fundamental stellar parameters of ϵ Eridani, 61 Cygni A and the Sun.
| Star | ϵ Eridani(a),(b) | 61 Cygni A(c),(d) | Sun (e) |
|---|---|---|---|
| HD | 22040 | 201091 | – |
| Spectral type | K 2 V | K 5 V | G 2 V |
| Teff (K) | 5146 ± 31 | 4545 ± 40 | 5780 ± 10 |
| Mass (M⊙) | 0.82 ± 0.03 | 0.69 ± 0.03 | 1.00 |
| Age: V&F(f) (Gyr) |
 |
– | – |
| Age: Chromo(g) (Gyr) | 0.49 | 1.33 | – |
| Age: other (Gyr) | 0.44 | 6.00 ± 1.00 | 4.57 ± 0.11 |
| v sin i (km s−1) | 2.40 ± 0.4 | 0.94 ± 1.0 | 1.60 ± 0.4 |
| Prot (d) | 11.40 | 35.00 | 24.47 |
| Rossby No | 0.44 | 1.41 | 2.18 |
Log( ) |
–4.40 to –4.50 | –4.51 to –4.67 | –4.85 to –5.00 (i) |
| S-index cycle (j),(k)(yr) | 2.95 ± 0.03, 12.70 ± 0.30 | 7.30 ± 0.1 | 11.04 ± 1.20 |
| Log(Lx/Lbol) | –4.80 | –5.58 | –6.24 |
Notes. Listed are the effective temperature (Teff), mass, age and projected rotational velocity (v sin i) of the stars.
References. (a)Valenti & Fischer (2005); (b)Barnes (2007); (c)Affer et al. (2005); (d)Kervella & Fouqué (2008); (e)Wright et al. (2011); (f)Valenti & Fischer (2005); (g)Marsden et al. (2014); (h)Metcalfe et al. (2013); (i)Lockwood et al. (2007); (j)Baliunas et al. (1995); (k)Bonanno et al. (2002). The convective turnover time, used to compute the Rossby number, and X-ray luminosity (Log(Lx/Lbol)) are taken from Wright et al. (2011).
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