Table 2.
Pulsation ephemeris data for the components of double Cepheids.
| Constant P | Linear dP/dt | O−C | ||||||
|---|---|---|---|---|---|---|---|---|
| OGLE ID | Mode | T0 [days] | period [days] | period [days] | dP/dt | AI [mag] | r | Flags |
| BLG-CEP-067-A | 1O | 6728.9156 | 2.610720(4) | 2.610719(4) | 2.1e−08 [2.0σ] | 0.138 | E+P | – |
| BLG-CEP-067-B | 1O | 6728.1099 | 1.6923770(29) | 1.6923836(27) | −7.1e−08 [11σ] | 0.086 | −0.60 | – |
| GD-CEP-0291-A | F | 7241.9130 | 3.667699(13) | 3.667720(17) | −7.8e−08 [2.0σ] | 0.279 | E+E | – |
| GD-CEP-0291-B | F | 7239.6049 | 3.398977(14) | 3.398970(14) | 5.6e−08 [1.5σ] | 0.275 | −0.42 | – |
| LMC-CEP-0571-A | F | 5656.6539 | 3.0798876(21) | 3.0798760(26) | −1.7e−08 [7.0σ] | 0.230 | P+E | – |
| LMC-CEP-0571-B | 1O | 5633.7415 | 2.100785(4) | 2.100815(4) | 4.4e−08 [11σ] | 0.088 | −0.94 | – |
| LMC-CEP-0835-A | F | 5062.4994 | 4.562725(4) | 4.562714(5) | −2.5e−08 [3.5σ] | 0.226 | O+O? | LTTE |
| LMC-CEP-0835-B | F | 4985.9788 | 2.7508653(16) | 2.7508776(20) | 2.3e−08 [9.0σ] | 0.210 | −0.83 | – |
| LMC-CEP-1718-A | 1O | 3923.5083 | 2.4809134(14) | 2.4809078(14) | −1.8e−08 [11σ] | 0.134 | P+E | ECL |
| LMC-CEP-1718-B | 1O | 3914.7558 | 1.9636626(11) | 1.9636615(12) | −4.1e−09 [2.9σ] | 0.096 | 0.33 | – |
| SMC-CEP-1526-A | F | 4038.4523 | 1.8043149(6) | 1.8043146(6) | −1.1e−09 [1.6σ] | 0.264 | O+O | LTTE |
| SMC-CEP-1526-B | F | 3751.2473 | 1.29022591(26) | 1.29022616(25) | 1.6e−09 [5.1σ] | 0.334 | −0.97 | – |
| SMC-CEP-2699-A | 1O | 4942.2171 | 2.5622543(28) | 2.5622527(29) | −8.5e−09 [2.2σ] | 0.134 | E+P | LTTE |
| SMC-CEP-2699-B | F | 4780.6972 | 2.1174356(12) | 2.1174265(10) | −3.9e−08 [29σ] | 0.208 | 0.34 | – |
| SMC-CEP-2893-A | F | 5326.5241 | 1.32155113(30) | 1.3215514(4) | 3.7e−10 [0.8σ] | 0.453 | E+E | 1C |
| SMC-CEP-2893-B | F | 5292.0427 | 1.1358590(4) | 1.1358595(4) | 9e−10 [1.9σ] | 0.245 | 0.44 | – |
| SMC-CEP-3115-A | F | 4558.5922 | 1.2519451(3) | 1.25194563(29) | 4.3e−09 [10σ] | 0.420 | O+O | LTTE |
| SMC-CEP-3115-B | F | 4603.3492 | 1.15978962(26) | 1.15978938(25) | −4.2e−09 [11σ] | 0.372 | −0.94 | – |
| SMC-CEP-3674-A | F | 5009.1460 | 2.8960253(25) | 2.8960260(28) | 2.3e−09 [0.7σ] | 0.163 | O+O | LTTE |
| SMC-CEP-3674-B | 1O | 5008.9881 | 1.8277750(19) | 1.8277743(20) | −2.5e−09 [1.0σ] | 0.108 | −0.82 | – |
| LMC-CEP-0571-A | F | 4929.8173 | 3.0799661(9) | 3.0798934(19) | −4e−08 [43σ] | 0.228 | P+E | – |
| LMC-CEP-0571-B | 1O | 4820.7063 | 2.1007583(13) | 2.1007901(28) | 1.9e−08 [13σ] | 0.088 | −0.76 | – |
| LMC-CEP-0835-A | F | 4556.0275 | 4.5627231(27) | 4.562725(4) | 1.3e−09 [0.5σ] | 0.225 | E+O | LTTE |
| LMC-CEP-0835-B | F | 4232.2570 | 2.7508940(10) | 2.7508739(14) | −1.8e−08 [21σ] | 0.207 | −0.55 | – |
| LMC-CEP-1718-A | 1O | 3097.3722 | 2.4809333(10) | 2.4809322(10) | −2.5e−08 [23σ] | 0.134 | P+E | ECL |
| LMC-CEP-1718-B | 1O | 3044.8611 | 1.9636670(8) | 1.9636673(8) | −5.1e−09 [5.5σ] | 0.095 | 0.81 | – |
Notes. Two ephemerides are presented, assuming either a constant period (P) or a linear period change (dP/dt). The same reference time (T0, maximum brightness at I-band for a constant P) is used for both. Errors in the last digits are given in parentheses. For dP/dt, the significance in sigma is given in brackets. In the penultimate column, a different information is given in rows for each component. O−C means the type of O−C variability for both Cepheids (E – erratic, P – parabolic, O – orbital motion), r is the correlation parameter for these variabilities. Flags: 1C – at least 1 orbital cycle is covered, ECL – eclipsing system, LTTE – anticorrelated light travel-time effect detected. Results for the OGLE data only are given above the double horizontal line, while those using additional MACHO data are shown below.
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