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We report the first detection of the magnetic field in a star of FS CMa type,a subgroup of objects characterized by the B[e] phenomenon. The split ofmagnetically sensitive lines in IRAS 17449+2320 determines the magnetic fieldmodulus of 6.2+/-0.2 kG. Spectral lines and their variability reveal thepresence of a B-type spectrum and a hot continuum source in the visible. Thehot source confirms GALEX UV photometry. Because there is a lack of spectrallines for the hot source in the visible, the spectral fitting gives only thelower temperature limit of the hot source, which is 50 000 K, and the upperlimit for the B-type star of 11 100 K. The V/R ratio of the H alpha line showsquasiperiodic behavior on timescale of 800 days. We detected a strongred-shifted absorption in the wings of Balmer and OI lines in some of thespectra. The absorption lines of helium and other metals show no, or verysmall, variations, indicating unusually stable photospheric regions for FS CMastars. We detected two events of material infall, which were revealed to bediscrete absorption components of resonance lines.  The discovery of the strong magnetic field together with the Gaiameasurements of the proper motion show that the most probable nature of thisstar is that of a post-merger object created after the leaving the binary ofthe birth cluster. Another possible scenario is a magnetic Ap star aroundTerminal-Age Main Sequence (TAMS). On the other hand, the strong magnetic fielddefies the hypothesis that IRAS 17449+2320 is an extreme classical Be star.Thus, IRAS 17449+2320 provides a pretext for exploring a new explanation of thenature of FS CMa stars or, at least, a group of stars with very similarspectral properties.

First detection of a magnetic field in low-luminosity B[e] stars: New scenarios for the nature and evolutionary stages of FS CMa stars