Bibcode
Kuulkers, E.; in't Zand, J. J. M.; Cornelisse, R.; Heise, J.; Kong, A. K. H.; Charles, P. A.; Bazzano, A.; Cocchi, M.; Natalucci, L.; Ubertini, P.
Referencia bibliográfica
Astronomy and Astrophysics, v.358, p.993-1000 (2000)
Fecha de publicación:
6
2000
Revista
Número de citas
26
Número de citas referidas
22
Descripción
During the 1996/1997 outburst of the X-ray transient GRO J1655-40 the
Wide Field Cameras onboard BeppoSAX observed the system with nearly
continuous coverage during some stages of this outburst. On two
occasions we find clear evidence for frequent dipping behaviour,
characterized by several absorption dips occurring within one binary
orbit. However, during preceding and following binary orbits there is no
sign of such dips at the same range of orbital phases. We also collected
light curves of absorption dips as seen with other X-ray instruments.
Although the 65 dips that were collected occur preferably between
orbital phases 0.68 and 0.92, there is evidence that the morphology of
the material causing the dips is changing over just one binary orbit.
The short duration (~ minutes) and phasing of the dips are discussed in
the framework of models where the stream from the companion star
encounters a hot outer rim on the accretion disk.