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Table 1.

Basic data for known double Cepheids.

Component A
Component B
OGLE ID Modes P1 [days] P 1 F $ P_1^F $ [days] P2 [days] P 2 F $ P_2^F $ [days] P 2 F / P 1 F $ P_2^F/P_1^F $ V [mag] I [mag] Refs.
BLG-CEP-067 1O + 1O 2.610721 3.827 1.692381 2.444 0.639 16.33 14.51 (3)
GD-CEP-0291 F + F 3.667693 3.668 3.398977 3.399 0.927 14.65 12.70 (3)
LMC-CEP-0571 F + 1O 3.079937 3.080 2.100885 3.057 0.992 15.70 14.86 (1), (2)
LMC-CEP-0835 F + F 4.562781 4.563 2.750956 2.751 0.603 15.25 14.46 (1), (2)
LMC-CEP-1718 1O + 1O 2.480909 3.649 1.963683 2.869 0.786 15.19 14.51 (1), (2), (4)
SMC-CEP-1526 F + F 1.804311 1.804 1.290234 1.290 0.715 16.83 16.16 (2)
SMC-CEP-2699 1O + F 2.562225 3.772 2.117341 2.117 0.561 16.06 15.38 (2)
SMC-CEP-2893 F + F 1.321549 1.321 1.135859 1.136 0.860 16.93 16.38 (2)
SMC-CEP-3115 F + F 1.251945 1.252 1.159784 1.160 0.926 16.66 16.18 (2)
SMC-CEP-3674 F + 1O 2.896089 2.896 1.827785 2.665 0.920 15.79 15.13 (2)

Notes. Period (Pi) and fundamentalized period ( P i F $ P_i^F $) are given for each component (i = 1, 2) of a given double Cepheid. LMC-CEP-1718 is the only one already spectroscopically confirmed. References are given in the last column.

References. (1) Alcock et al. (1995), (2) Soszyński et al. (2017), (3) Udalski et al. (2018), (4) Pilecki et al. (2018).

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