Table 1
Parameters of neutron stars in X-ray binaries.
| System | M(M⊙) | Mc(M⊙) | Porb(d) | Pspin(ms) | Eccentricity | type | Refs. |
|
|
|||||||
| 4U 1538-52 |
|
|
3.73 | 5.28 × 105 | 0.08 | HMXB | X1 |
| SMC X-1 | 1.05 ± 0.09 | 15.5 ± 1.5 | 3.89 | 708 | <4 × 10-5 | HMXB | X2 |
| Cen X-3 | 1.24 ± 0.24 | 19.7 ± 4.3 | 2.09 | 4814 | <8 × 10-4 | HMXB | X3 |
| LMC X-4 | 1.31 ± 0.14 | 15.6 ± 1.8 | 1.41 | 1.35 × 104 | <0.01 | HMXB | X2 |
| Vela X-1 | 1.88 ± 0.13 | 23.1 ± 0.2 | 8.96 | 2.83 × 105 | 0.09 | HMXB | X4 |
| 1.86 ± 0.16 | 23.8 ± 0.2 | 8.96 | 2.83 × 105 | 0.09 | HMXB | X4 | |
| 4U1700 − 37* | 2.44 ± 0.27 | 58 ± 11 | 3.41 | No | 0.2 | HMXB | X5 |
| Her X-1 | 1.5 ± 0.3 | 2.3 ± 0.3 | 1.70 | 1240 | <3 × 10-4 | XB | X6 |
| 4U1820-30 |
|
≤ 0.106 | 0.08 | 6.9 × 105 | No | XB | X7 |
| 2A 1822-371 | 0.97 ± 0.24 | 0.33 ± 0.05 | 0.23 | 590 | <0.03 | LMXB | X8 |
| XTE J2123-058 |
|
|
0.25 | 3.9 | No | LMXB | X9 |
| Cyg X-2 | 1.78 ± 0.23 | 0.60 ± 0.13 | 9.84 | No | 0.0 | LMXB | X10 |
| 1.5 ± 0.3 | 0.63 ± 0.16 | 9.84 | No | 0.0 | LMXB | X10 | |
| V395 CAR/2S 0921ĺC630 | 1.44 ± 0.10 | 0.35 ± 0.03 | 9.02 | No | No | LMXB | X11 |
| Sax J 1808.4-3658 | <1.4 | <0.06 | 0.08 | 2.49 | <0.0005 | LMXB | X12 |
| HETE J1900.1-2455 | <2.4 | <0.085 | 0.06 | 2.65 | <0.005 | LMXB | X13 |
Notes. LMXB – Low-mass X-ray binary, HMXB – High-mass X-ray binary.
The compact object may be a black hole (Lattimer & Prakash 2007).
References. X1 – van Kerkwijk et al. (1995) (M, Mc, Porb, eccentricity); Robba et al. (2001) (Ps). X2 – van Kerkwijk et al. (1995) (Porb, eccentricity); van der Meer et al. (2005) (M, Mc); van der Meer et al. (2007) (Ps). X3 – van Kerkwijk et al. (1995); Ash et al. (1999) (Porb, eccentricity); van der Meer et al. (2005) (M, Mc); van der Meer et al. (2007) (Ps). X4 – Quaintrell et al. (2003) (M = 2.27,1.88 M⊙, Mc, Porb, eccentricity, Ps); Barziv et al. (2001) (M = 1.86 M⊙). X5 – Clark et al. (2002) (M, Mc); Hammerschlag-Hensberge et al. (2003) (Porb, eccentricity). X6 – Cheng et al. (1995) (Porb, eccentricity); Reynolds et al. (1997) (M, Mc); Liu et al. (2000) (Ps); van der Meer et al. (2007) (Ps). X7 – Wang et al. (2010) (M, Mc, eccentricity, Ps); Shaposhnikov et al. (2004) (M, Porb); Dib et al. (2005) (Porb). X8 – Jonker & van der Klis (2001) (Porb, eccentricity, Ps); Jonker et al. (2003) (M, Mc). X9 – Tomsick et al. (1999) (Ps); Tomsick et al. (2002) (M, Mc, Porb, eccentricity). X10 – Cowley et al. (1979) (Ps); Orosz & Kuulkers (1999) (M, Mc, Porb, eccentricity); Elebert et al. (2009a). X11 – Steeghs & Jonker (2007) (1.44 M⊙); Shahbaz & Watson (2007) (1.370.13 M⊙). X12 – Elebert et al. (2009b); Chakrabarty & Morgan (1998); Jain et al. (Porb). X13 – Elebert et al. (2008); Kaaret et al. (2006) (Porb).
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