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Fig. 10


Hardness-intensity diagram obtained using all the RXTE/PCA observations available (adapted from Muñoz-Darias et al. 2011b). Intensity corresponds to the count rate in the 2–15 keV band and hardness is defined as the ratio of counts in 6.1–10.2 keV and 3.3−6.1 keV bands. Each point corresponds to the average over an observation. Observations with a star correspond to those with a so-called type-B QPO in the power-density spectra (see text). A solid line joins consecutive observations starting from observation with a big, open circle (top right). Observations taken after the last type-B QPO are joined by a dotted line. The three arrows mark the observations with clear transition dips on days 23.7, 24.0 and 26.1. All observations between days 0 and 10, i.e., when absorption dips occur, have hardness values  ≳0.45.

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