出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：After seven years in quiescence, GRO J1655-40 started a new outburst in February 2005, rising
to a high/soft state in March 2005. We report here the results of four XMM-Newton observations
performed on 27 February 2005 in the low/hard state, and on three consecutive days in March
2005 during the rise of the source to its high/soft state. The X-ray spectrum of GRO J1655-40
was dominated in the high/soft state by the thermal emission from the accretion disk, with a
maximum temperature of 1.3 keV. We detected two absorption lines in the EPIC-pn spectra at
6.7–6.8 and 7.8–8.0 keV, which could be identified as the Ka and Kb lines of either blended
Fe XXV and Fe XXVI or blueshifted Fe XXV. We found no orbital dependence on the X-ray
properties, which provides an upper limit for the inclination of the system of 73
