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Home All issues Volume 711 (July 2026) A&A, 711 (2026) A297 Full HTML
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Table 1.

Best-fit parameters of ξ Tau models. The ‘original’ one is taken from Nemravová et al. (2016), Table 15.

Original Reference All-data Tides 5-component
Var. Unit val. val. val. val. val. σ
msum M⊙ 8.881594 9.547810 9.549357 9.557040 10.410026 0.2
q1 1 0.900146 0.948223 0.948717 0.948208 0.948885 0.001
q2 1 0.880155 0.852451 0.854879 0.852786 0.876618 0.01
q3 1 0.113367 0.175785 0.163744 0.177839 0.174983 0.01
q4 1 0.080957 0.01
P1 d 7.148234 7.147145 7.147156 7.147136 7.147000 0.000010
log e1 1 −∞ −2.8400 −2.8525 −2.8627 −2.8212 0.01
i1 ° 86.530 86.702 87.185 86.847 87.120 0.1
Ω1 ° 331.364 328.461 328.368 328.451 328.428 1.0
ϖ1 ° 245.479 113.967 116.317 119.557 120.890 1.0
λ1 ° 61.501 58.399 58.359 58.369 58.208 0.1
P2 d 145.744 145.792 145.785 145.784 145.772 0.01
log e2 1 −0.7044 −0.6829 −0.6829 −0.6829 −0.6826 0.01
i2 ° 86.676 86.546 86.554 86.598 86.655 1.0
Ω2 ° 328.902 328.347 328.349 328.347 328.444 1.0
ϖ2 ° 338.521 341.105 341.108 341.106 341.447 1.0
λ2 ° 64.198 63.587 63.587 63.587 63.811 1.0
P3 d 18503.8 18876.8 18877.1 18878.9 18887.0 100
log e3 1 −0.2451 −0.2421 −0.2396 −0.2420 −0.2417 0.01
i3 ° −26.275 −23.748 −23.031 −23.820 −23.956 1.0
Ω3 ° 108.252 101.844 102.066 102.121 101.376 1.0
ϖ3 ° 117.247 117.918 117.949 117.901 117.994 1.0
λ3 ° 148.550 148.445 148.334 148.433 148.450 1.0
T1 K 10540 11000 10540 10555 100
T2 K 10318 10602 10318 10318 100
T3 K 14046 14000 14046 13983 100
T4 K 6751† 6487† 6800† 6737† 300
T5 K 6737† 300
log g1 1 4.364 4.337 4.364 4.355 0.01
log g2 1 4.343 4.355 4.343 4.343 0.01
log g3 1 4.300 4.238 4.300 4.257 0.01
log g4 1 4.240† 4.258† 4.237† 4.241† 0.01
log g5 1 4.241† 0.01
vrot, 1 km s−1 14.600 15.203 15.203 10
vrot, 2 km s−1 13.281 15.210 15.210 10
vrot, 3 km s−1 242.262 242.371 242.371 10
vrot, 4 km s−1 65.234 65.234 65.234 30
vrot, 5 km s−1 65.234 30
Δt1 s 800 100 100
Δt2 s 800 100 100
C20, 1 1 0.000 0.000 0.001
C20, 2 1 0.000 0.000 0.001
γ km s−1 8.82 10.180 11.022 9.870 9.625 0.5
d pc 67.88 65.994 66.138 66.015 67.947 1.0
nsky 96 106 106 106 106
nrv 834 260 822 1103 1103
netv 35 48 77 77 77
necl 4 47 47 47 47
nvis – 16678 16678 16678 16678
nclo – 4533 4533 4533 4533
nt3 – 4117 4117 4117 4117
nlc – – 18489 – –
nsyn – – 1753731 – –
nsed – 7 7 7 7
nsed2 – 14 14 14 14
n 978 482 1798621 1354 1354
χsky2 185 301 324 289 233
χrv2 2237 1152 3686 3377 3286
χetv2 151 20.2 76.6 392‡ 453‡
χecl2 3.3 20.3 144! 21.1 43.4
χvis2 – 174346 160495 174207 120467
χclo2 – 62129 42703 61131 48651
χt32 – 26618 23463 25681 18191
χlc2 – – 160870 – –
χsyn2 – – 3246892 – –
χsed2 – 18.5 297! 18.8 28.8
χsed22 – 40.9 224! 46.3 40.3
χ2 2578 1553 3639180 4145 4085

Notes. The notation is as follows: mi for ∀i the masses; q1 = m2/m1, q2 = m3/(m1 + m2), and q3 = m4/(m1 + m2 + m3) are mass ratios; Pi period; log ei logarithm of eccentricity; ii inclination; Ωi longitude of the ascending node; ϖi longitude of the pericentre; λi mean longitude in orbit; Ti effective temperature; log gi logarithm of gravitational acceleration; vrot, i rotational velocity; C20, i oblateness; Δti tidal time lag; n number of observations; χ2 unreduced value; χ2/n would be reduced one; † constrained by mass using Harmanec (1988); ‡ with ETV uncertainties of the order of 10−4 d ≃ 0.1 min. The epoch of osculating elements is 2456224.724705 (TDB). The angular elements are expressed in the observer’s reference frame.

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