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Multiwavelength monitoring of Be/X-ray binaries is crucial to understand themechanisms producing their outbursts. H 1145-619 is one of these systems, whichhas recently displayed X-ray activity. We investigate the correlation betweenthe optical emission and the X-ray activity to predict the occurrence of newX-ray outbursts from the inferred state of the circumstellar disc. We haveperformed a multiwavelength study of H 1145-619 from 1973 to 2017 and presenthere a global analysis of its variability over the last 40 years. We have usedoptical spectra from the SAAO, SMARTS and SALT telescopes and opticalphotometry from INTEGRAL/OMC and ASAS. We also used X-ray observations fromINTEGRAL/JEM-X, and IBIS to generate the light curves and combined them withSwift/XRT to extract the X-ray spectra. In addition, we have compiled archivalobservations and measurements from the literature to complement these data.Comparing the evolution of the optical continuum emission with the Halpha linevariability, we have identified three different patterns of opticalvariability: Global increases and decreases of the optical brightness (observedfrom 1982 to 1994 and from 2009 to 2017) that can be explained by thedissipation and replenishment of the circumstellar disc, superorbitalvariations with a period of Psuperorb~590 days (observed in 2002-2009) whichseems to be related with the circumstellar disc, and optical outbursts(observed in 1998-1999 and 2002-2005) that we interpret as mass ejections. Wehave discovered the presence of a retrograde one-armed density wave, whichappeared in 2016 and is still present in the circumstellar disc. We havecarried out the most complete long-term optical study of the Be/X-ray binary H1145-619 in correlation with its X-ray activity. We found for the fist time thepresence of a retrograde density perturbation in the circumstellar disc of aBe/X-ray binary.

Long-term optical and X-ray variability of the Be/X-ray binary H 1145-619: discovery of an on-going retrograde density wave