Table 1
Orbital and spin parameters for IGR J17511-3057.
| Parameter | Value |
|
|
|
| RA (J2000) (Nowak et al. 2009) | 17h51m0866 |
| Dec (J2000) (Nowak et al. 2009) | −30°57′410 |
| Orbital period Porb (s) | 12487.5121(4) |
| Projected semi-major axis, axsini (lt-ms) | 275.1952(18) |
| Ascending node passage, T ⋆ (MJD) | 55 088.0320279(4) |
| Eccentricity, e | <3 × 10-5 |
| Mass function(1), fx (M⊙) | 1.070854(21) × 10-3 |
| Reference epoch, T0 (MJD) | 55 088.0 |
| Mean spin frequency, ν0 (Hz) | 244.83395156(7) |
|
|
|
Constant
model best-fit parameters
|
|
|
1.74(238.5/137) |
| Spin frequency at T0, ν0 (Hz) | 244.83395145(9) |
| Spin frequency derivative,
(Hz s-1) |
1.45(16) × 10-13 |
|
|
|
| Physical model best-fit parameters | |
|
|
1.70(232.8/137) |
| Spin frequency, ν0 (Hz) | 244.83395145(9) |
| Accretion rate at T0 ( M⊙ year-1) | 0.92(10) × 10-9 |
Notes. Errors are intended to be at 1σ c.l., upper limits are given at 95% confidence level. Times are given with respect to the barycentre of the Solar System (TDB). Best-fit spin parameters are derived for both hypotheses of a constant spin-up and flux dependent spin-up, and the uncertainties in the given values of ν, ν̇, and Ṁmax include systematics due to the uncertainties in the source position (see text). Here we report only the second harmonic best-fit spin parameters. (1) This value was obtained using the latest available measure of G, c (http://physics.nist.gov/cuu/Constants/) and M⊙ (http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html).
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