A preliminary orbital period of Swift J1749-2807

Details A preliminary orbital period of Swift J1749-2807 A preliminary orbital period of Swift J1749-2807

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2568....1b&link_type=abstract

The Astronomer's Telegram, #2568

Astronomy and Astrophysics

Astronomy

3

X-Ray, Binaries, Neutron Stars, Transients

Scientific paper

We analyzed the spin period evolution of Swift J1749-2807 during four RXTE observations, the two reported in ATel #2567 and ATel #2565, plus two observations beginning at April 15 21:42UT and April 16 4:57UT. The spin frequency was observed to vary between 1035.6 and 1036.3 Hz (not barycentered). A preliminary fit with a sinusoid yields an orbital modulation period of 3.19x104 seconds, corresponding to 8.86 hr.

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