The Swift -BAT hard X-ray sky monitoring unveils the orbital period of the HMXB IGR J16493-4348
2010; Oxford University Press; Volume: 406; Issue: 1 Linguagem: Inglês
10.1111/j.1745-3933.2010.00872.x
ISSN1745-3933
AutoresG. Cusumano, V. La Parola, P. Romano, A. Segreto, S. Vercellone, G. Chincarini,
Tópico(s)Pulsars and Gravitational Waves Research
ResumoIGR J16493-4348 is a supergiant high mass X-ray binary discovered by INTEGRAL in 2004. The source is detected at a significance level of $\sim21$ standard deviations in the Swift-BAT survey data collected during the first 54 months of the Swift mission. The timing analysis reveals an orbital period of $\sim$6.78 days and the presence of a full eclipse of the compact ob\ ject. The dynamical range (variability up to a factor $\sim$20) observed during the BAT monitoring suggests that IGR J16493-4348 is a wind-fed system. The derived semi-major axis of the binary system is $\sim55 R_{\sun}$ with an orbit eccentr\ icity lower than 0.15.
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