出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present a detailed study of the absorption and dipping behavior of the accreting High Mass Xray Binary GX 301-2. We use data from the XMM-Newton observatory to study the low energy continuum and the iron line complex and data from the Rossi X-ray Timing Explorer (RXTE) to model the continuum and study lightcurves. The analysis of the RXTE data shows that the source is strongly variable: the source exhibits intense flaring as well as dipping activity. The source countrate as recorded by the RXTE-PCA drops to almost zero during some of the dips in the lightcurve. A similar dipping behavior has been observed in the Vela X-1 as well as a number of other massive wind accreting sources. We present a detailed spectral and temporal study of the dips and discuss possible scenarios to explain the dips. The high qualityXMMtiming mode data are taken during the pre-periastron flare. We accumulate an overall spectrum with very high signal to noise ratio and model it with a partial covering model. The high signal allows us to obtain spectra as short as 30 s to track the evolution of the photoelectric absorption and thus the density of the material in the stellar wind.
