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Table 1

Orbital parameters for the binaries.

Name D e P a sin i i d min Ref.
[pc] [days] [AU] [°] [R⊙]
High-eccentricity binaries
EK Cep 164 0.109 4.43 0.077 89.3* 14.7 1,2
UZ Tau E 140 0.33 19.13 0.124 54 22.1 3
RX J0530.7−0434 460 0.32 40.57 0.336 78.5  >49.1 4,5
Parenago 1540 470 0.12 33.73 0.188 ···  >35.6 6
Parenago 2494 470 0.257 19.48 0.146 ···  >23.3 7
GG Ori 438 0.222 6.63 0.116 89.2* 19.4 8
Circular binaries
RX J0350.5−1355 450** 0 9.28 0.115 ···  >24.7 4
V826 Tau 150 0 3.89 0.013 13 12.6 9
RX J0529.4+0041 A 325 0 3.04 0.053 86.5* 11.5 10
Parenago 1802 420 0.029 4.67 0.050 78.1* 10.7 11
RX J0541.4−0324 450** 0 4.99 0.074 ···  >15.9 4
NGC 2264 Walk 134 913 0 6.35 0.099  <73  >21.3 12,13
Binaries already known to exhibit flares
DQ Tau 140 0.556 15.80 0.053 23 12.9 14
V773 Tau A 148.4 0.272 51.10 0.35 66.0 60.0 15

Notes. e – eccentricity; P – orbital period; a – semimajor axis; i – inclination; dmin – separation during periastron (or a lower limit for systems with an unknown inclination);

∗

– indicates eclipsing binaries;

∗∗

– substituted average distance to Orion.

References. 1 – Gimenez & Margrave (1985); 2 – Torres et al. (2010); 3 – Jensen et al. (2007); 4 – Covino et al. (2001); 5 – Marilli et al. (2007); 6 – Marschall & Mathieu (1988); 7 – Reipurth et al. (2002); 8 – Torres et al. (2000); 9 – Reipurth et al. (1990); 10 – (Covino et al. 2004); 11 – Stassun et al. (2008); 12 – Padgett & Stapelfeldt (1994); 13 – Baxter et al. (2009); 14 – Mathieu et al. (1997); 15 – Boden et al. (2007).

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