IOP Publishing Ltd.;United States: American Astronomical Society
摘要:
摘要： The high-mass X-ray binary SMC X-l is an eclipsing binary with an orbital period of 3.89 days. This system exhibits a superorbital modulation with a period varying between ~40 days and ~65 days. We present a phase-resolved analysis of both the spectra and the orbital profiles with the superorbital phase derived from the HHT. The X-ray spectra observed by the Proportional Counter Array on board the Rossi X-ray Timing Explorer are fitted well by a blackbody plus a Comptonized component. The plasma optical depth, which is a good indicator of the distribution of material along the line of sight, is significantly anti-correlated with the flux detected at 2.5-25 keV. This indicates that the accretion disk has a bulge that absorbs considerable X-ray emission in the stream-disk interaction region. The dip width is anti-correlated with the flux, and this relation can be interpreted by the precessing tilted accretion disk scenario. 出版者： United States: American Astronomical Society 出版日期： 2013-08-10 出處： The Astrophysical Journal, 2013-08, Vol.773 (1), p.58--8 資源來源： IoP Science journals 識別號： ISSN: 0004-637X 識別號： ISSN: 1538-4357 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637x/773/1/58
