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Table 1

Stellar parameters.

Parameter τ Gem 91 Aqr
HIP 34693 HIP 114855

Spectral type K2III K0III
mv [mag]a 4.41 4.24
Mv [mag] −0.56 ± 0.05 0.93 ± 0.03
K [mag]b 1.681 ± 0.254 1.597 ± 0.236
B − V [mag]a 1.261 ± 0.000 1.107 ± 0.005
Parallax [mas]a 10.16 ± 0.25 21.78 ± 0.29
Distance [pc] 45.9 ± 0.6
Radius [R]c 26.8 ± 0.7 11.0 ± 0.1
Teff [K]c 4388 ± 25 4665 ± 18
log g   [cm   s-2c 1.96 ± 0.08 2.52 ± 0.05
[Fe/H]d 0.14 ± 0.1 −0.03 ± 0.1
Mass [M]c 2.3 ± 0.3 1.4 ± 0.1
Age [Gyr]c 1.22 ± 0.76 3.56 ± 0.63
Absolute RV [km s]e 22 −26
vsini [km s]  <1.0f 3.9 ± 0.5g

References. 

(a)

Data from Hipparcosvan Leeuwen (2007).

(b)

Data from 2MASS: Skrutskie et al. (2006).

(e)

This paper, data acquired using CRIRES, see Sect. 5.2.

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