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Table 1

Basic parameters and their variation for the twin-peak and amplitude-changing Cepheid sample.

CEP I(cat) DI P(cat) DP TP A(cat) A1 DA1
FU Cepheids with twin peaks
1140 13.910 0.008 8.1864915 94 5920 0 495 220.2 0.3 7.1 22
1418 15.518 0.008 2.8957105 27 2317 1 274 120.7 0.3 3.4 0
1621 15.138 0.017 3.3588290 19 5930 59 544 218.3 0.5 7.1 0
1748 14.267 0.007 6.6320016 53 7411 10 547 224.1 0.3 9.4 76
1833 13.091 0.033 19.1635310 587 92 244 20 575 267.9 0.8 9.6 0
1932 15.171 0.019 2.9467014 16 5484 74 532 208.3 0.6 11.3 0
1998 15.267 0.015 3.0863817 15 1504 25 519 208.3 0.4 4.7 0
2132 14.634 0.011 4.6823873 74 19 867 68 402 163.8 0.9 4.3 0
2180 15.495 0.010 2.5877856 9 2674 56 563 217.4 0.4 7.5 0
2191 14.819 0.019 4.2070310 19 4997 69 619 235.3 0.4 9.2 0
2289 15.155 0.011 3.7126964 17 2436 19 470 191.6 0.3 6.3 0
2470 15.291 0.008 3.2211085 19 2478 31 555 211.8 0.5 6.5 0
FO Cepheids with twin peaks
1405 14.857 0.012 2.7807164 57 8209 33 217 107.3 0.6 13.1 15
1521 14.680 0.013 3.2147769 97 16 927 61 184 89.7 0.7 8.4 0
1527 15.830 0.019 1.4923973 52 8598 52 136 64.7 1.1 34.8 55
1535* 15.928 0.036 1.2509786 42 6899 31 139 63.7 1.4 59.4 46
1536 15.503 0.009 1.6112568 68 10 112 0 54 25.1 0.5 27.5 73
1561 15.813 0.028 1.5299801 12 1746 27 264 128.2 0.5 9.1 5
1564 15.362 0.009 2.0629824 25 1920 0 152 74.6 0.4 2.1 0
1605 14.601 0.010 3.0881609 31 4351 35 236 114.5 0.3 5.7 14
1693 16.141 0.017 1.6639538 18 1841 0 174 85.3 0.5 7.0 0
1704 15.376 0.010 1.8820681 49 7939 57 180 89.2 1.0 5.3 0
2118 15.060 0.009 2.4461347 26 3158 32 176 87.0 0.3 4.4 0
2217 14.895 0.008 2.3120543 187 27 774 35 133 63.4 1.9 6.0 101
FO Cepheids with changing amplitudes
0916 16.062 0.016 1.3695732 67 6725 26 88 42.5 1.1 53.3 58
1119* 15.617 0.010 1.7431985 119 19 536 59 76 35.7 1.0 51.5 68
1275* 16.417 0.009 0.9474017 33 5796 48 92 43.9 1.3 45.0 69
1955 15.668 0.016 1.8879224 47 5830 18 109 53.0 0.6 24.8 78
2820 16.119 0.034 2.1127656 39 4134 45 230 110.9 0.7 16.8 34

Notes. The columns of the table are the following: CEP: Cepheid identifier (without the common prefix OGLE-LMC-CEP-); I(cat): mean I magnitude from the OGLE-III catalog; DI: maximal span max I0 (t) − min I0(t) of the variation of the kernel-estimated mean magnitude I0(t); P(cat): primary pulsation period from the OGLE-III catalog (in days); : the error of the primary pulsation period from the OGLE-III catalog (in 10−7 days); DP: maximal span of the variation of the primary pulsation period max P(t) − min P(t) from the kernel fits (in 10−7 days); TP: length of time intervals exhibiting significant deviation from P(cat), in percentage of the total time span; A(cat): peak-to-peak amplitude from the OGLE-III catalog (in millimagnitudes); A1: estimated amplitude of the first harmonic term from the average global fit using the fixed period P(cat) (in millimagnitudes); : standard error of the former (in millimagnitudes); DA1: maximal span of the variation of the first harmonic amplitude max A1 (t) − min A1(t) from the kernel fits (in millimagnitudes); : length of time intervals exhibiting significant deviation from A1, in percentage of the total time span. Asterisk beside the identifier indicates the three stars which are commented in the OGLE-III catalog as having variable amplitude.

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