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We consider donor evolution and mass transfer in the microquasar V404 Cyg/GS2023+338. Based on X-ray observations of its two outbursts, its average massaccretion rate is substantially lower than our model mass-loss rate from itslow-mass giant donor. A likely solution to this discrepancy is that a largefraction of the mass flowing from the donor leaves the binary in the form ofoutflows from the accretion disc around the accretor. The outflow can beparameterizes by the fractions of the mass and angular momentum leaving thesystem. We calculate the latter as a function of the radius of the accretiondisc from which the outflow takes place. We then perform detailed evolutionarycalculations for V404 Cyg. Given our estimated average accretion rate, $>$70per cent of the mass lost from the donor has to leave the binary. The allowedsolutions for the actual donor mass loss rate are parameterized by our twooutflow parameters. Our results are in agreement with the observed outflowsfrom the outer disc as well as with the variable near-Eddington accretionobserved during the outbursts, compatible with outflows from the vicinity ofthe black hole. We then calculate the expected rate of the orbital periodchange. Its future measurements can constrain the presence of an outflow inV404 Cyg and its parameters.

Non-conservative mass transfer in stellar evolution and the case of V404 Cyg/GS 2023+338