The Orbit and Position of the X-ray Pulsar XTE J1855-026 - an Eclipsing Supergiant System

Details The Orbit and Position of the X-ray Pulsar XTE J1855-026 - an Eclipsing Supergiant System The Orbit and Position of the X-ray Pulsar XTE J1855-026 - an Eclipsing Supergiant System

2002-07-08

arxiv.org/abs/astro-ph/0207181v1

Astrophys.J. 577 (2002) 923-928

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/342244

A pulse timing orbit has been obtained for the X-ray binary XTE J1855-026 using observations made with the Proportional Counter Array on board the Rossi X-ray Timing Explorer. The mass function obtained of ~16Mo together with the detection of an extended near-total eclipse confirm that the primary star is a supergiant as predicted. The orbital eccentricity is found to be very low with a best fit value of 0.04 +/- 0.02. The orbital period is also refined to be 6.0724 +/- 0.0009 days using an improved and extended light curve obtained with RXTE's All Sky Monitor. Observations with the ASCA satellite provide an improved source location of R.A. = 18h 55m 31.3s}, decl. = -02o 36' 24.0" (2000) with an estimated systematic uncertainty of less than 12". A serendipitous new source, AX J1855.4-0232, was also discovered during the ASCA observations.

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