## 5. ConclusionsWe analyzed the temporal behavior of GRS 1915+105 using the set of
9 1. For all individual observations the tight correlation between the duration of a hard episode and the minimal QPO frequency was found. 2. For half of the observations
this correlation is satisfactory described by the standard radiation
pressure dominated disk theory assuming that the QPO frequency and the
duration of a hard episode are proportional to the Keplerian frequency
and the viscous time on the inner edge of the disk respectively. The
derived values of the mass accretion rate for these observations are
in the range . Not all observations
fit this dependence. In fact for the large fraction the relation
breaks. It should be noted, that for
these observations the correlation
(Belloni et al. 1997 3. The temporal evolution of the QPO frequency during the rise
phase of the hard episodes can be explained as a change of the
Keplerian frequency at the inner edge of optically thick accretion
disk caused by its viscous motion. © European Southern Observatory (ESO) 1999 Online publication: November 3, 1999 |