Post-common envelope binaries from SDSS - VII: A catalogue of white dwarf-main sequence binaries

Abstract

We present a catalogue of 1602 white dwarf-main sequence binaries (WDMS) from the spectroscopic Sloan Digital Sky Survey Data Release 6 (SDSS DR6). Among these we identify 440 as new WDMS binaries. We select WDMS binary candidates from template fitting all 1.27 million DR6 spectra, using combined constraints in both ${\chi }^2$ and signal-to-noise ratio. In addition, we use Galaxy Evolution Explorer (GALEX) and UKIRT Infrared Sky Survey (UKIDSS) magnitudes to search for objects in which one of the two components dominates the SDSS spectrum. We use a decomposition/fitting technique to measure the effective temperatures, surface gravities, masses and distances to the white dwarfs, as well as the spectral types and distances to the companions in our catalogue. Distributions and density maps obtained from these stellar parameters are then used to study both the general properties and the selection effects of WDMS binaries in SDSS. We also make use of SDSS-GALEX-UKIDSS magnitudes to investigate the distribution of WDMS binaries, as well as their white dwarf effective temperatures and companion star spectral types, in ultraviolet to infrared colour space. We show that WDMS binaries can be very efficiently separated from single main sequence stars and white dwarfs when using a combined ultraviolet, optical, and infrared colour selection. Finally, we also provide radial velocities for 1068 systems measured from the \Lines{Na}{I}{8183.27,8194.81} absorption doublet and/or the H$\alpha$ emission line. Among the systems with multiple SDSS spectroscopy, we find five new systems exhibiting significant radial velocity variations, identifying them as post-common-envelope binary candidates.

Accepted in MNRAS. The paper contains 19 figures and 10 tables. Tables 2, 3, 5, 7 and 9 will be published in full online only

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