Orbital Modulation and Long Term Spin-up Rate of SWIFT J1626.6-5156
Abstract
We report on the long-term pulse period history of the ~15.35s X- ray pulsar SWIFT J1626.6-5156 obtained from pulse timing analysis of RXTE- PCA observations between MJD ~53724 and MJD ~54379. A preliminary circular orbit fit to the pulse period history between MJD ~53924 (200 days after the first observation) and MJD ~54379 reveals an orbital period of ~132.9 days. From this preliminary fit to the pulse period history, we obtain an (a/c)sini value of ~405sec which corresponds to a mass function value of ~4.2 Solar mass.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- October 2009
- Bibcode:
- 2009ATel.2250....1B
- Keywords:
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- X-ray;
- Binaries;
- Neutron Stars;
- Pulsars;
- Transients