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We present an updated version of the spectroscopic catalogue of whitedwarf-main sequence (WDMS) binaries from the Sloan Digital Sky Survey (SDSS).We identify 939 WDMS binaries within the data releases (DR) 9-12 of SDSS plus40 objects from DR 1-8 that we missed in our previous works, 646 of which arenew. The total number of spectroscopic SDSS WDMS binaries increases to 3294.This is by far the largest and most homogeneous sample of compact binariescurrently available. We use a decomposition/fitting routine to derive thestellar parameters of all systems identified here (white dwarf effectivetemperatures, surface gravities and masses, and secondary star spectral types).The analysis of the corresponding stellar parameter distributions shows thatthe SDSS WDMS binary population is seriously affected by selection effects. Wealso measure the NaI 8183.27, 8194.81 absorption doublet and Halpha emissionradial velocities (RV) from all SDSS WDMS binary spectra identified in thiswork. 98 objects are found to display RV variations, 62 of which are new. TheRV data are sufficient enough to estimate the orbital periods of three closebinaries.

The SDSS spectroscopic catalogue of white dwarf-main sequence binaries: new identifications from DR9-12