0620054

We ask for four 90 ks long observations of the high mass X-ray binary 4U 1907+09 spread out over INTEGRALs AO6. The source shows a rich phenomenology and might be a missing link with respect to Supergiant Fast X-ray Transients. The observations will allow us to study the dip/non-dip duty cycle of the source. They will represent one of the best data sets to date to test our newly developed physical models for cyclotron lines for a moderately bright source since 4U 1907+09 is persistent (although dipping and flaring) and shows two lines. Also after almost 20 years of continuous spin down 4U 1907+09 was recently discovered by our team to have undergone a torque reversal episode and is now spinning up. This type of behavior is very rare and monitoring the pulse period evolution now provides a unique opportunity to constrain models for the torquing of the neutron star by the accreted material. [truncated! Please see actual data for full text]