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Table 1
Stellar parameters.
| Parameters | HD 3574 | 63 Cyg | HD 216946 | Reference |
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| Spectral type | K5 III | K4 Ib-II | M0 Iab var | Hipparcos (ESA 1997) |
| mv [mag] | 5.45 | 4.56 | 4.99 | Hipparcos (ESA 1997) |
| B − V [mag] | 1.644 ± 0.015 | 1.569 ± 0.012 | 1.778 ± 0.013 | van Leeuwen (2007) |
| d [pc] | – | 314.46 ± 22.95 | 480.82 ± 61.06 | Anderson & Francis (2012) |
641.0  |
316.5  |
490.2  |
Derived | |
| RV [km s-1] | –6.6 ± 0.8 | –26.32 ± 0.23 | –9.5 ± 0.7 | Kharchenko et al. (2007) |
| π [mas] | 1.56 ± 0.34 | 3.16 ± 0.23 | 2.04 ± 0.26 | van Leeuwen (2007) |
| Teff [K] | 4420 | 4080 | 3650 | Wright et al. (2003) |
4399  |
4170  |
4680  |
Ammons et al. (2006) | |
| 3830 | – | – | Sánchez-Blázquez et al.(2006) | |
| – | – | 3800 | Massey et al. (2009) | |
| – | 4150 | – | Lafrasse et al. (2010) | |
| – | – | 4000 ± 200 | Soubiran et al. (2010) | |
| 4048 ± 28 | – | – | Prugniel et al. (2011) | |
| log g | – | 1.9 | – | Lafrasse et al. (2010) |
| 1.44 | – | – | Sánchez-Blázquez et al. (2006) | |
| – | – | 0.5 ± 0.3 | Soubiran et al. (2010) | |
| 1.13 ± 0.14 | – | – | Prugniel et al. (2011) | |
| [ Fe / H ] | –0.01 | – | – | Sánchez-Blázquez et al. (2006) |
| – | – | –0.07 ± 0.13 | Soubiran et al. (2010) | |
| 0.10 ± 0.05 | – | – | Prugniel et al. (2011) | |
| 0.08 ± 0.06 | – | –0.02 | Anderson & Francis (2012) | |
| – | – | –0.03 | Cesetti et al. (2013) | |
| R⋆ [R⊙] | – | 35 | 350 | Pasinetti-Fracassini et al. (2001) |
| M⋆ [M⊙] | 7.7 ± 0.4 | – | 6.8 ± 1.0 | Tetzlaff et al. (2011) |
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