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We present results of our spectroscopic observations of nine detachedeclipsing binaries (DEBs), selected from the $Kepler$ Eclipsing Binary Catalog,that only show one set of spectral lines. Radial velocities (RVs) werecalculated from the high resolution spectra obtained with the HIDES instrument,attached to the 1.88-m telescope at the Okayama Astrophysical Observatory, andfrom the public APOGEE archive. In our sample we found five single-linedbinaries, with one component dominating the spectrum. The orbital and lightcurve solutions were found for four of them, and compared with isochrones, inorder to estimate absolute physical parameters and evolutionary status of thecomponents. For the fifth case we only update the orbital parameters, andestimate the properties of the unseen star. Two other systems show orbitalmotion with a period known from the eclipse timing variations (ETVs). For thesewe obtained parameters of outer orbits, by translating the ETVs to RVs of thecentre of mass of the eclipsing binary, and combining with the RVs of the outerstar. Of the two remaining ones, one is most likely a blend of a faintbackground DEB with a bright foreground star, which lines we see in thespectra, and the last case is possibly a quadruple bearing a sub-stellar massobject. Where possible, we compare our results with literature, especially withresults from asteroseismology. We also report possible detections of solar-likeoscillations in our RVs.

HIDES spectroscopy of bright detached eclipsing binaries from the $Kepler$ field - I. Single-lined objects