Table 1
Known ultracompact X-ray binaries and candidates.
| Name | Porb (min) | d (kpc) | Location | Composition | Accretor | References | ||
|
|
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| 4U 1820–30 | 11.42 | 7.6 ± 0.4 | NGC 6624 | He (burst-model) | burst | 1-p, 2-d, 3, 4, 5-c, 6-a | ||
| 4U 0513–40 | 17 | 12.2 | NGC 1851 | He | burst | 7-pc, 8-a | ||
| 2S 0918–549 | 17.4 | 4.8 ± 0.6 | Disk | C, O? (opt), He (burst) | burst | 9-p, 10, 11-d, 12, 13-c, 14-a | ||
| 4U 1543–624 | 18.2 | ~7? | Disk | C, O? (opt), O (X) | – | 15-pd, 12, 16-c | ||
| 4U 1850–087 | 20.6 | 8.2 ± 0.6 | NGC 6712 | Ne-excess | burst | 17-p, 2-d, 18-c, 19, 20-a | ||
| M 15 X-2 | 22.58 | 10.4 | M 15 | He, C (UV) | burst | 21-pc, 22-d, 23, 24-a | ||
| XTE J1807–294 | 40.07 | 8.3 ± 1.5? | Bulge? | msp | 25-p, 26-a | |||
| 4U 1626–67 | 41.4 | ~8 | C, O (opt), O (UV, X) | pulsar | 27-pa, 28-d, 29, 30, 31, 32-c | |||
| XTE J1751–305 | 42.42 | 8.3 ± 1.5? | Bulge? | msp | 33-pa | |||
| XTE J0929–314 | 43.58 | 10 ± 5 | He, C, N | msp | 34-pca, 35, 36-d, 29-c | |||
| 4U 1916–05 | 49.48 | 8.9 ± 1.3 | He, N (opt) | burst | 37, 38-p, 39-d, 29-c, 40, 41-a | |||
| SWIFT J1756.9–2508 | 54.70 | 8.3 ± 1.5? | Bulge? | He (model) | msp | 42-pca | ||
| NGC 6440 X-2 | 57.3 | 8.5 ± 0.4 | NGC 6440 | msp | 43-pa, 44-d | |||
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| 4U 1728–34 (GX 354–0) | 10.77? | 5.3 ± 0.8 | burst, msp | 45, 46-p, 11-d, 47, 48, 49-a | ||||
| NGC 6652 B | 43.6? | 10.0 | NGC 6652 | burst | 50-p, 22-d, 51-a | |||
| 4U 0614+091 | 51.3? | 3.2 | C, O (opt), O (X) | burst, msp | 52, 53, 54-p, 55-d, 12, 30, 56-c, 57, 58, 59, 60-a | |||
|
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| 1A 1246–588 | 4.3 | 61, 62-d | ||||||
| 4U 1812–12 | 61 | |||||||
| 4U 1822–000 | 63 | |||||||
| 4U 1905+000 | 8 | 64 | ||||||
| ω Cen qLMXB | NGC 5139 | 65 | ||||||
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| 1RXS J170854.4-321857 | 66 | |||||||
| SAX J1712.6-3739 | 63 | |||||||
| 1RXS J171824.2-402934 | 66 | |||||||
| 4U 1722-30 | Terzan 2 | 63 | ||||||
| 1RXS J172525.2-325717 | 63 | |||||||
| SLX 1735-269 | 63 | |||||||
| SLX 1737-282 | 63 | |||||||
| SLX 1744-299 | 63 | |||||||
Notes. The four groups separated by horizontal lines are confirmed UCXBs, UCXB candidates with tentative orbital period, UCXB candidates with a low ratio of optical to X-ray luminosity and UCXB candidates with persistent behavior at low luminosity, respectively. The columns list source name, orbital period Porb, distance d, location within the Galaxy, chemical composition and indication of accretor type (“msp” = millisecond pulsar, “burst” = Type 1 X-ray burst). Sources with coordinates very near the Galactic bulge are assumed to be located in the bulge. Distances are taken from Liu et al. (2007) unless indicated otherwise. In the references column, “p” refers to orbital period, “c” to composition, “d” to distance and “a” to accretor signal.
References. 1) Stella et al. (1987); 2) Kuulkers et al. (2003); 3) Bildsten (1995); 4) Podsiadlowski et al. (2002); 5) Cumming (2003); 6) Grindlay et al. (1976); 7) Zurek et al. (2009); 8) Forman & Jones (1976); 9) Zhong & Wang (2011); 10) Cornelisse et al. (2002); 11) Jonker & Nelemans (2004); 12) Nelemans et al. (2004); 13) in’t Zand et al. (2005b); 14) Jonker et al. (2001); 15) Wang & Chakrabarty (2004); 16) Madej & Jonker (2011); 17) Homer et al. (1996); 18) Juett et al. (2001); 19) Swank et al. (1976); 20) Hoffman et al. (1980); 21) Dieball et al. (2005); 22) Harris (1996, 2010 edition); 23) Dotani et al. (1990); 24) van Paradijs et al. (1990); 25) Markwardt et al. (2003a); 26) Markwardt et al. (2003b); 27) Middleditch et al. (1981); 28) Chakrabarty (1998); 29) Nelemans et al. (2006); 30) Werner et al. (2006); 31) Schulz et al. (2001); 32) Homer et al. (2002); 33) Markwardt et al. (2002); 34) Galloway et al. (2002); 35) Wijnands et al. (2005); 36) Liu et al. (2007); 37) White & Swank (1982); 38) Walter et al. (1982); 39) Galloway et al. (2008); 40) Becker et al. (1977); 41) Lewin et al. (1977); 42) Krimm et al. (2007); 43) Altamirano et al. (2010); 44) Ortolani et al. (1994); 45) Galloway et al. (2010); 46) Wilson-Hodge et al. (2012); 47) Lewin et al. (1976); 48) Hoffman et al. (1976); 49) Strohmayer et al. (1996); 50) Deutsch et al. (2000); 51) in’t Zand et al. (1998); 52) Shahbaz et al. (2008); 53) Hakala et al. (2011); 54) Zhang et al. (2012); 55) Kuulkers et al. (2010); 56) Madej et al. (2010); 57) Swank et al. (1978); 58) Brandt et al. (1992); 59) Ford et al. (1997); 60) Strohmayer et al. (2008); 61) Bassa et al. (2006); 62) in’t Zand et al. (2008); 63) in’t Zand et al. (2007); 64) Jonker et al. (2006); 65) Haggard et al. (2004); 66) in’t Zand et al. (2005a).
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