A Refined Orbital Solution and the Transient Pulsar in Terzan 5 is Not Eclipsing

Details A Refined Orbital Solution and the Transient Pulsar in Terzan 5 is Not Eclipsing A Refined Orbital Solution and the Transient Pulsar in Terzan 5 is Not Eclipsing

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2946....1s&link_type=abstract

The Astronomer's Telegram, #2946

Astronomy and Astrophysics

Astronomy

5

X-Ray, Binary, Neutron Star, Transient, Pulsar

Scientific paper

We report results of recent RXTE observations of the new bursting and pulsing transient in Terzan 5 (ATels #2919, #2920, #2922 ,#2924, #2929, #2932, #2933, #2937, #2939, #2940). Barycentric pulse frequency measurements from eight orbits of data spanning 00:13 on 2010-10-13 to 2010-10-15 at 10:53 UTC are consistent with a circular orbit with parameters;
Orbital Period = 21.252 +- 0.02 hrs; Pulsar frequency = 11.044893 +- 8.7 x 10-6 Hz; vsini = 62.13 +- 0.46 km/sec; asini = 2503.12 +- 19 lt-ms; Epoch of T90 = 55482.8883 +- 0.0013 MJD (TDB)
The epoch of T90 based on this solution is approximately 47 minutes earlier than the mid-eclipse point (ATEL #2929), which is inconsistent if the orbit is indeed circular (ATEL #2939).

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