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Table 2.

Orbital parameters for Cepheid systems that have spectroscopic orbital parameters.

Target ϖ Porb⋆ MJD0⋆ e⋆ ω⋆ K1⋆ i Ω a a m1† m2
(mas) (d) (°) (km s−1) (°) (°) (au) (mas) (M⊙) (M⊙)
U Aql 3.630.96 18316.5 475758 0.1930.005 1672 8.40.04 6510 3455 5.640.22 20.475.47 5.200.78 1.940.29
FF Aql 1.840.11 14302.6 5829614 0.0610.007 3164 4.80.01 897 6110 4.470.19 8.220.59 5.000.75 0.830.12
V0496 Aql 0.970.05 10661.9 4548017 0 0 3.60.18 447 28330 3.830.17 3.720.25 5.700.85 0.890.13
RX Cam 0.810.04 11140.5 459312 0.4590.007 781 14.30.11 716 9119 4.210.15 3.410.21 5.400.81 2.610.39
delta Cep 3.390.05 22026.3 5565025 0.6740.038 2475 1.50.24 16314 8327 5.850.24 19.860.88 4.800.72 0.720.11
AX Cir 1.770.34 653225.0 4850060 0.1900.020 2318 10.00.50 1306 322 14.660.53 26.005.14 4.700.70 5.150.77
VZ Cyg 0.460.03 218310.0 4481036 0 0 3.00.16 1619 35628 6.180.22 2.870.20 4.600.69 2.000.30
V1334 Cyg 1.180.07 19382.1 4360614 0.1970.009 2263 14.10.10 1186 2086 6.180.22 7.290.49 4.600.69 3.800.57
T Mon 0.560.07 32449726.0 49300143 0.4140.013 2043 8.40.19 11917 8751 50.391.90 28.323.49 7.801.17 8.411.26
S Nor 1.090.04 358433.0 4563867 0 0 2.50.35 15423 3643 8.870.34 9.670.53 5.700.85 1.550.23
AW Per 1.070.06 13954181.0 5258028 0.4740.008 2501 10.30.08 426 5611 27.221.01 29.152.05 5.000.75 8.821.32
W Sgr 1.210.41 161611.0 5799220 0.1970.018 2886 1.60.01 1512 5920 5.010.21 6.052.08 5.300.79 1.120.17
V0350 Sgr 1.010.05 14720.2 505267 0.3520.001 2840 10.40.01 3512 30338 5.160.17 5.240.30 4.700.70 3.750.56
V0636 Sco 1.010.04 13230.0 344113 0.2500.001 2900 11.90.01 948 29214 4.590.18 4.610.27 5.100.76 2.250.34
U Vul 1.080.04 25102.8 4480016 0.6750.033 3534 3.60.44 1637 32036 7.150.25 7.740.39 5.400.81 2.350.35
Y Car 0.690.10 9932.0 4537213 0.3800.020 12917 8.90.30 15021 21438 3.730.14 2.570.40 4.200.63 2.820.42
YZ Car 0.350.03 8300.2 536045 0.0270.003 2722 10.20.01 8613 6037 3.570.13 1.250.12 6.901.03 1.930.29
SU Cas 2.150.08 4070.0 502786 0 0 1.00.08 4815 27517 1.650.07 3.540.21 3.500.53 0.110.02
BY Cas 0.510.04 5635.0 493845 0.2200.020 28810 9.11.00 3122 18851 2.550.09 1.300.10 4.500.67 2.440.37
DL Cas 0.450.03 6840.2 471612 0.3500.006 271 16.40.11 14181 31095 3.280.11 1.480.12 5.400.81 4.690.70
XX Cen 0.570.04 9241.1 448608 0 0 4.50.28 3813 16430 3.570.14 2.020.17 5.900.89 1.230.18
SU Cyg 1.200.05 5490.0 437661 0.3500.004 2241 29.80.15 987 10018 2.730.09 3.270.18 4.300.64 4.700.71
MW Cyg 0.730.04 4400.2 4886215 0.1400.030 7813 6.40.19 9420 23760 2.010.08 1.460.10 4.900.73 0.720.11
Z Lac 0.490.04 3830.1 4658222 0.0250.012 34421 10.40.10 9524 17380 2.000.08 0.970.09 5.900.89 1.340.20
S Mus 1.160.12 5060.2 485566 0.0860.004 1942 14.90.01 808 13670 2.480.09 2.880.31 5.700.85 2.240.34
S Sge 0.670.09 6760.0 480102 0.2380.005 2031 15.60.06 6016 2109 3.080.11 2.070.30 5.500.82 3.000.45
X Sgr 3.460.20 5740.6 4820819 0 0 2.30.27 4218 23636 2.400.12 8.320.63 5.200.78 0.430.06
FN Vel 0.240.04 4720.1 559362 0.2200.010 2661 21.90.08 9310 29522 2.360.08 0.560.09 4.800.72 3.100.47

Notes. The lower part of the table lists the Cepheids with orbital periods shorter than 1000 days for which the orbital parameters and companion mass are poorly constrained (see Sect. 3.2.1). A null value for the eccentricity e and the argument of periastron ω indicates that the spectroscopic orbit was assumed to be circular. (⋆) Spectroscopic orbital elements.

References. The spectroscopic orbital elements were retrieved from the Szabados (2003b) database, based on the following references: Groenewegen (2013) for V0496 Aql, VZ Cyg, MW Cyg, RX Cam, DL Cas; Anderson et al. (2015) for δ Cep; Groenewegen (2008) for SU Cas, XX Cen, AX Cir, SU Cyg, Z Lac, T Mon, S Nor, S Sge, X Sgr, U Vul; Petterson et al. (2004) for Y Car; Griffin (2016) for AW Per; Gallenne et al. (2018) for U Aql, FF Aql, V1334 Cyg, S Mus, W Sgr, V0350 Sgr, V0636 Sco; Gorynya et al. (1995) for BY Cas; Anderson (2013), https://archive-ouverte.unige.ch/unige:35356 for FN Vel; Anderson et al. (2016a) for YZ Car.

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