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Table 1.

Astrophysical information of the binary system Ross 867-8.

Ross 867 Ross 868
Spectral type(1) M4.5V M3.5V
Mass(2) (M) 0.311 ± 0.132 0.376 ± 0.040
Parallax(1) (mas) 92.967 ± 0.061 92.988 ± 0.050
Distance(3, 14) (pc) 10.753 ± 0.007 10.751 ± 0.006
Radius (R) [0.27–0.51](9, 7) [0.478–0.535](6, 4)
−34.6 ± 0.2 −34.9 ± 0.1
−226.1 ± 0.1 −214.8 ± 0.1
355.3 ± 0.1 351.0 ± 0.1
Age(12) (Myr) [90–300] [25–300]
Teff (K) 2667(2) 3319 ± 100(6)
V sin i(km s−1) [6.79–10](5, 8) [1.0–28.5](4, 6, 7, 10, 11, 12, 13)
B(1) (mag) 14.67 12.98
R(1) (mag) 12.65 ± 0.06 11.34 ± 0.02
G(1) (mag) 11.456 ± 0.001 10.137 ± 0.001
J(1) (mag) 8.23 ± 0.02 7.27 ± 0.02
H(1) (mag) 7.64 ± 0.03 6.71 ± 0.03
K(1) (mag) 7.35 ± 0.03 6.42 ± 0.02
XMM(13) [0.2–12 keV] 3.4 ± 0.1 2.1 ± 0.1
(10−12 erg s−1 cm−2)
Chandra(13) [0.3–11 keV] 1.26 ± 0.03 1.25 ± 0.02
(10−12 erg s−1 cm−2)

Notes. When several measurements differ, a range in square brackets is given.

References. (1) The SIMBAD astronomical database (Wenger et al. 2000). (2) Jenkins et al. (2009). (3) Gaia Collaboration (2018). (4) Houdebine (2012). (5) Jeffers et al. (2018). (6) Houdebine et al. (2016). (7) Caillault & Patterson (1990). (8) McLean et al. (2012). (9) White et al. (1989). (10) Moutou et al. (2017). (11) Reiners et al. (2012). (12) Shkolnik et al. (2012). (12) Kiraga & Stepień (2007). (13) This work. (14) Assuming geometrical distance calculation from parallax made by Bailer-Jones et al. (2018).

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