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The B[e]/K binary system MWC 623 was reinvestigated using new spectroscopicobservations. The absorption lines of the K and the B star do not exhibit anysignificant radial velocity variations over a time interval of 14 years. Thespectral classification using a recent echelle spectrum yielded spectral typesof K2II-Ib and B4III. The luminosity class of the K star gives an estimate ofthe distance towards MWC 623 of 2.4(+1.4/-0.9) kpc. This is consistent with thekinematic distance of 2.0(+0.6/-0.3) kpc. The masses derived from the locationsof the binary components in the H-R diagram are 7+-1.5 Msun and 7.5+-2.5 Msunfor the B and K star, respectively, i.e. the mass ratio is close to 1. Bothstars are coeval with an age of 50+10/-20 Myr as shown by the comparison withisochrones. The high luminosity of the K star excludes a pre-main sequenceevolutionary phase as explanation for the strong LiI lambda 6708 absorptionline observed in the late-type component. Rather, the high lithium abundance isa consequence of the young age. Likewise, the B[e] star is a slightly evolvedobject starting it post-main sequence evolution.Comment: 8 pages, 11 figures, 3 tables, accepted for publication in Astronomy  & Astrophysic

New spectroscopic observations of the B[e]/K binary system MWC 623