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Table 1
Stellar parameters for α Ari.
| Parameter | Value | Reference |
|
|
||
| Spectral type | K2 III | Hekker & Meléndez (2007) |
| mv [mag] | 2.01 | Hipparcos |
| Mv [mag] | 0.48 ± 0.09 | Hipparcos |
| B − V [mag] | 1.151 | Hipparcos |
| Parallax [mas] | 49.48 ± 0.99 | Hipparcos |
| Diameter [mas] | 6.412 ± 0.064 | Hipparcos |
| Distance [pc] | 20.2 | Hipparcos |
| RV [km s-1] | –14.6 ± 0.1 | Evans (1967) |
| Teff [K] | 4480 | McWilliam (1990) |
| 4850 ± 150 | Berdyugina et al. (1991) | |
| 4481 ± 11 | Gray et al. (2002) | |
| 4553 ± 15 | This work | |
| [ Fe/H ] | –0.25 | McWilliam (1990) |
| –0.22 | Mozurkewich et al. (1991) | |
| –0.09 ± 0.03 | This work | |
| log g | 2.57 ± 0.2 | McWilliam (1990) |
| 2.6 ± 0.3 | Berdyugina et al. (1991) | |
| 2.33 ± 0.06 | This work | |
| M ⋆ [M⊙] | 1.5 ± 0.2 | This work |
| R ⋆ [R⊙] | 13.9 ± 0.3 | derived |
| vrot sin i [km s-1] | 3.44 | Hekker & Meléndez (2007) |
| 3.1 ± 1 | Carney et al. (2008) | |
| Prot/sin i [days] | 172–335 | derived |
| vmicro [km s-1] | 1.7 | McWilliam (1990) |
| 1.40 ± 0.06 | This work | |
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