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The population of radio-loud stars has to date been studied primarily througheither targeted observations of a small number of highly active stars orwidefield, single-epoch surveys that cannot easily distinguish stellar emissionfrom background extra-Galactic sources. As a result it has been difficult toconstrain population statistics such as the surface density and fraction of thepopulation producing radio emission in a particular variable or spectral class.In this paper we present a sample of 36 radio stars detected in a circularpolarisation search of the multi-epoch Variables and Slow Transients (VAST)pilot survey with ASKAP at 887.5~MHz. Through repeat sampling of the VAST pilotsurvey footprint we find an upper limit to the duty cycle of M-dwarf radiobursts of 8.5 per cent, and that at least $10 \pm 3$ per cent of the populationshould produce radio bursts more luminous than $10^{15}$ erg s$^{-1}$Hz$^{-1}$. We infer a lower limit on the long-term surface density of suchbursts in a shallow 1.25 mJy PSF$^{-1}$ sensitivity survey of $9^{+11}_{-7}\times 10^{-3}$ deg$^{-2}$ and an instantaneous radio star surface density of$1.7 \pm 0.2 \times 10^{-3}$ deg$^{-2}$ on 12 min timescales. Based on theserates we anticipate ${\sim}200 \pm 50$ new radio star detections per year overthe full VAST survey and ${\sim}41\,000^{+10\,000}_{-9\,000}$ innext-generation all-sky surveys with the Square Kilometre Array.

Multi-epoch sampling of the radio star population with the Australian SKA Pathfinder