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To add to the growing collection of well-studied double periodic variables(DPVs) we have carried out the first spectroscopic and photometric analysis ofthe eclipsing binary DQ Velorum to obtain its main physical stellar and orbitalparameters. Combining spectroscopic and photometric observations that coverseveral orbital cycles allows us to estimate the stellar properties of thebinary components and the orbital parameters. We also searched forcircumstellar material around the more massive star. We separated DQ Velorumcomposite spectra and measured radial velocities with an iterative method fordouble spectroscopic binaries. We obtained the radial velocity curves andcalculated the spectroscopic mass ratio. We compared our single-lined spectrawith a grid of synthetic spectra and estimated the temperature of the stars. Wemodeled the V-band light curve with a fitting method based on the simplexalgorithm, which includes an accretion disc. To constrain the main stellarparameters we fixed the mass ratio and donor temperature to the values obtainedby our spectroscopic analysis. We obtain donor and gainer masses, the radii,and temperatures for the stellar components. We find that DQ Vel is asemi-detached system consisting of a B3V gainer and an A1III donor star plus anextended accretion disc around the gainer. The disc is filling 89% of thegainer Roche lobe and it has a concave shape that is thicker at its edge thanat its centre. We find a significant sub-orbital frequency of 0.19 d^{-1} inthe residuals of the V-band light curve, which we interpret as a pulsation ofan slowly pulsating B-type (SPB) of a gainer star. We also estimate thedistance to the binary (3.1 kpc) using the absolute radii, apparent magnitudes,and effective temperatures of the components found in our study.

Fundamental stellar and accretion disc parameters of the eclipsing binary DQ Velorum