Table 1: XMM-Newton observations used in this work.
Obs. ID HD Other name Exposure (ks) Start time Type Distance (pc)H
148790101 16157 CC Eri 22.36 2003-08-08 09:21:36 K7Ve/M4S 11.51
111520101 12230 47 Cas 50.9 2001-09-11 02:21:19 F0V+G $^{\natural}$ 33.56
112880701 19356 Algol 45 2002-02-12 04:42:18 B8V+G8IIIB 28.46
111530101 129333 EK Dra 54.9 2000-12-30 14:45:20 G0VH 33.94
134540401 22468 HR1099 26.42 2001-08-18 03:47:57 G5IV+K1IVS 28.97
49350101 - Proxima Cen 67.41 2001-08-12 04:16:02 M5.5VH 1.295
56030101 131156 $\xi $ Boo 59 2001-01-19 11:14:41 G8VH 6.7
111480101 62044 $\sigma $ Gem 55.8 2001-04-06 16:46:36 K1IIIH 37.48
H - HIPPARCOS catalog (Perryman et al. 1997). S - Strassmeier et al. (1993). B - Budding et al. (2004). $^{\natural}$ - X-ray active component is not detected directly in the optical. It is assumed to be a fast rotating solar analog (Güdel et al. 1998; Telleschi et al. 2005).

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