XTE J1859+083
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Monitoring data
Coordinates
| Ra | 284.75887 | Dec | 8.254142 | NuSTAR observed coordinates |
| Ra | 18h 59m 01.57s | Dec | +08d 14' 44.2" | Coordinates in ATel #7067 |
Ephemeris
M. Kühnel from Fermi/GBM pulse periods:
| P | 37.9 ± 0.05 d | |
| T0 | MJD 57078.79 (+0.14, -0.06) | periastron passage |
| a sin i | 215.1 ± 0.4 lt-s | |
| ε | 0.1251 ± 0.017 | |
| ω | -115.77 (+0.08, -0.16) |
On the Fermi/GBM pulsar project website (on 2015-04-17)
| P | 38.176 d | |
| T90 | JD 2457063.048 | |
| a sin i | 213.19 lt-s | |
| ε | 0.1309 | |
| ω | ? |
Pulse period around 9.8s [1].
Literature
Only one good paper: [1]. Postulated 60.65d orbit and found pulse period with 9.8s. RXTE spectra with typical pulsar spectrum, no CRSF. Recent 2015 data analysis by [2] with a focus on companion search.
Available data
NuSTAR observation on 2015, March 30/31, for 20ks. Pulse period clearly detected at 9.789s, with Matthias orbit (probably consistent with GBM results). Spectrum best described by NPEX with black-body and FeKα line, but FDcut and cutoffpl also work.
Actually NPEX and FDcut do not work as well as a cutoff with bb, judging from the number of parameters.