Table 1. Physical parameters and age-rotation relation of well observed and studied solar proxies in comparison with the Sun (after Güdel, 2007). L_X refers to a range of 0.1–2.4 keV as measured by the ROSAT satellite.

HD 129333 [EK Dra]

G1.5 V

1.06

0.95

−3.61

2.68

0.1

HD 72905 [π¹ UMa]

G1.5 V

1.03

0.95

−4.47

4.9

0.3

HD 206860 [HN Peg]

G0 V

1.06

0.99

−4.52

4.86

0.3

HD 39587 [χ¹ Ori]

G1 V

1.01

0.96

−4.65

5.24

0.3

HD 1835 [BE Cet]

G2 V

0.99

1.02

−4.46

7.65

0.6

HD 20630 [κ¹ Cet]

G5 V

1.02

0.93

−4.73

9.21

0.65

HD 114710 [β Com]

G0 V

1.08

0.925

−5.52

12

1.6

HD 190406 [15 Sge]

G5 V

1.01

1.1

−5.64

13.5

1.9

Sun

G2 V

1

1

−6.29

25.4

4.6

HD 146233 [18 Sco]

G2 V

1.01

1.03

—

23

4.9

HD 128620 [α Cen A]

G2 V

1.1

1.22

−6.67

~30

5–6

HD 2151 [β Hyi]

G2 IV

1.1

1.9

−6.41

~28

6.7

HD 186408 [16 Cyg A]

G1.5 V

1

1.16

—

−35

8.5