Table 2
Observed period modulation in CVs.
| Object | Porb | Pmod | ΔP/P | Ref. | |
| [h] | [yr] | × 10-6 | |||
|
|
|||||
| V4140 Sgr | 1.47 | 6.9 | 0.93 | 1 | |
| DP Leo | 1.50 | 23.8 | 0.53 | 2 | |
| V2051 Oph | 1.50 | 22 | 0.30 | 1 | |
| OY Car | 1.51 | 35 | 0.52 | 3 | |
| EX Hya | 1.64 | 17.5 | 0.55 | 4 | |
| HT Cas | 1.77 | 36 | 0.44 | 5 | |
| Z Cha | 1.79 | 32.6 | 0.12 | 6 | |
| UZ For | 2.11 | 23.4 | 0.96 | 7 | |
| HS 0705+6700 | 2.30 | 15.7 | 1.82 | 8 | |
| HS 2231+2441 | 2.65 | 15.7 | 0.70 | 8 | |
| HW Vir | 2.80 | 15.7 | 1.92 | 9 | |
| NN Ser | 3.12 | 7.56 | 1.41 | 10 | |
| QS Vir | 3.62 | 7.86 | 0.59 | 11 | |
| IP Peg | 3.80 | 4.7 | 8.00 | 12 | |
| U Gem | 4.17 | 17.4 | 1.03 | 13 | |
| DQ Her | 4.65 | 17.7 | 1.73 | 14 | |
| UX UMa | 4.72 | 7.1, 10.7, 30.4 | 2.60 | 15 | |
| T Aur | 4.91 | 24 | 3.30 | 16 | |
| EX Dra | 5.03 | 21 | 3.01 | this work | |
| TV Col | 5.49 | 31 | 4.33 | 17 | |
| RW Tri | 5.57 | 7.6, 13.6 | 2.10 | 18 | |
| EM Cyg | 6.98 | 17.74 | 3.88 | 19 | |
| AC Cnc | 7.21 | 16.2 | 5.50 | 20 | |
References. (1) Baptista et al. (2003); (2) Qian et al. (2010a); (3) Greenhill et al. (2006); (4) Helier & Sproats (1992); (5) Borges et al. (2008); (6) Dai et al. (2009); (7) Dai et al. (2010b); (8) Qian et al. (2010c); (9) Qian et al. (2008); (10) Qian et al. (2009); (11) Qian et al. (2010b); (12) Wolf et al. (1993); (13) Dai & Qian (2009a); (14) Dai & Qian (2009b); (15) Rubenstein et al. (1991); (16) Dai & Qian (2010a); (17) Dai et al. (2010a); (18) Robinson et al. (1991); (19) Dai & Qian (2010b); (20) Qian et al. (2007).
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