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PSRJ 2032+4127 is only the second known gamma-ray binary where it isconfirmed that a young radio pulsar is in orbit around a Be-star. Theinteraction of the pulsar wind with the mass outflow from the companion leadsto broad band emission from radio up to TeV energies. In the current paper wepresent results of optical monitoring of the 2017 periastron passage with theNordic Optical Telescope. These observations are complemented by X-ray(Swift/XRT, NuSTAR) and GeV (Fermi/LAT) monitoring. Joint analysis of theevolution of the parameters of the Halpha line and the broadband (X-ray to TeV)spectral shape allows us to propose a model linking the observed emission tothe interaction of the pulsar and Be-star winds under the assumption of theinclined disc geometry. Our model allows the observed flux and spectralevolution of the system to be explained in a self-consistent way.

Multi-wavelength observations of PSRJ 2032+4127 during the 2017 periastron passage