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Title:
The Rossi X-ray Timing Explorer Eclipses From The Lmxb EXO0748-676
Authors:
Wolff, Michael Thomas; Ray, P. S.; Wood, K. S.
Affiliation:
AA(NRL), AB(NRL), AC(NRL)
Publication:
American Astronomical Society, AAS Meeting #213, #432.03; Bulletin of the American Astronomical Society, Vol. 41, p.299
Publication Date:
01/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21343203W

Abstract

We report our complete database of X-ray eclipse timings of the low mass X-ray binary EXO0748-676 observed by the Rossi X-Ray Timing Explorer (RXTE) satellite. As of this writing we have accumulated 441 full X-ray eclipses, 390 of which have been observed with the Proportional Counter Array on RXTE. These include both observations where an eclipse was specifically targeted and those eclipses found in the RXTE data archive. Eclipse cycle count has been maintained since the discovery of the EXO0748-676 system in February 1985. We describe our observing and analysis techniques for each eclipse and describe improvements we have made since our last large compilation by Wolff et al. (2002). The database contains the timing results from a seven-parameter fit to the X-ray light curve for each observed full X-ray eclipse along with the associated errors in the fitted parameters. Based on the standard O-C analysis, EXO0748-676 has undergone four distinct orbital period epochs since its discovery. In addition, EXO0748-676 shows small-scale events in the O-C curve that are likely due to short-lived changes in the secondary star.

This work was supported by NASA Astrophysical Data Analysis Program, the NASA RXTE Guest Observer Program, and by the Office of Naval Research.

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