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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