Table 2
Information about all observed (Col. 1) anomalous lows in Her X-1.
| Obs | No. | No. of | Turn- | No. of | Turn- | Dur. | Ref. |
| erved | of | 35 d | On | 35 d | On | of | |
| ALs | AL | cycl. | cycl. | AL | |||
| before | after | ||||||
| AL | [MJD] | AL | [MJD] | [d] | |||
|
|
|||||||
| AL 1 | 1 | 119 | 45 469 | 127 | 45 752 | 283 | 1, 2 |
| AL 2 | 3 | 226 | 49 205 | 229 | 49 308 | 103 | 3 |
| AL 3 | 4 | 284 | 51 224 | 302 | 51 826 | 602 | 4, 5, 6, 7 |
| AL 4 | 5 | 334 | 52 945 | 340 | 53 157 | 212 | 8 |
| AL 5 | 7 | 459 | 57 302 | 461 | 57 372 | 70 | 8 |
Notes. The turn-on times given are for the last observed turn-on before the AL, and the first turn-on after the end of the AL. Note that with the numbering of Col. 2, the mean repetition period of the ALs is ~ 5.5 yr (assuming that Nos. 2 and 6 were not observed). The 35 d cycle numbering is according to Staubert et al. (1983).
Reference. (1) EXOSAT: Parmar et al. (1985), (2) optical: Delgado et al. (1983), (3) Rosat/ASCA/BATSE/EUVE: Vrtilek et al. (1994), (4) RXTE/ASM: Levine & Corbet (1999), (5) BeppoSAX: Parmar et al. (1999), (6) RXTE: Coburn et al. (2000), (7) RXTE: Still et al. (2001), (8) RXTE/ASM/Swift/BAT: R. Staubert, this work.
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