| Z | Absolute metallicity (mass fraction of metals) |
| M1 | Initial primary mass |
| M2 | Initial secondary mass |
| a | Orbital separation (semimajor axis) |
| e | Orbital eccentricity |
| Porb | Orbital period |
| Ps | Spin period of the NS |
| MX | Compact object (NS/BH) mass |
| M⋆ | Mass of the donor star |
| R⋆ | Equatorial radius of the donor star |
| vKep | Equatorial Keplerian velocity of the donor star |
| vrot | Equatorial rotation velocity of the donor star |
| W | ≡ vrot/vKep with the initial value denoted by W0 |
| RL1 | Roche lobe size of the donor star at periastron (equation 6) |
| Rtrunc | ≡ ftrunca, average tidal truncation radius (equation 7) |
| Rcrit | VDD boundary beyond which gas flows are subsonic (equation 8) |
| cs | Sound speed in the ionised isothermal VDD |
| Σ0 | Base surface density of the VDD |
| α | Viscosity parameter of the VDD |
| |$\dot{M}_{\rm ej}$| | Mass ejection rate of the O/B star |
| |$\dot{M}_{\rm acc}$| | Peak/outburst accretion rate in the Be-XRB |
| Lbol | Bolometric luminosity during outbursts |
| ϵ | Radiative efficiency |
| |$\dot{M}_{\rm Edd}$| | Eddington limit of accretion rate (equation 15) |
| η | |$\equiv \dot{M}_{\rm acc}/\dot{M}_{\rm Edd}$|, Eddington ratio during outbursts |
| fduty | Effective fraction of time the Be-XRB spends in outbursts |
| LX | Outburst X-ray luminosity for a certain band |
| ψX | Calibration parameter for the observed LX − Porb relation |
| fcorr | Correction factor for outburst luminosity (Section 3.2) |
| τ | Lifetime of the Be-XRB |
| Mtot | Total stellar mass underlying the Be-XRB population |
| |$\mathcal {N}_{\rm X}$| | Number of Be-XRBs in the outburst phase per unit SFR |
| |$\mathcal {L}_{\nu }$| | Specific X-ray luminosity per unit SFR |
| |$\mathcal {L}_{\rm X}$| | X-ray luminosity per unit SFR for a certain band |
| Z | Absolute metallicity (mass fraction of metals) |
| M1 | Initial primary mass |
| M2 | Initial secondary mass |
| a | Orbital separation (semimajor axis) |
| e | Orbital eccentricity |
| Porb | Orbital period |
| Ps | Spin period of the NS |
| MX | Compact object (NS/BH) mass |
| M⋆ | Mass of the donor star |
| R⋆ | Equatorial radius of the donor star |
| vKep | Equatorial Keplerian velocity of the donor star |
| vrot | Equatorial rotation velocity of the donor star |
| W | ≡ vrot/vKep with the initial value denoted by W0 |
| RL1 | Roche lobe size of the donor star at periastron (equation 6) |
| Rtrunc | ≡ ftrunca, average tidal truncation radius (equation 7) |
| Rcrit | VDD boundary beyond which gas flows are subsonic (equation 8) |
| cs | Sound speed in the ionised isothermal VDD |
| Σ0 | Base surface density of the VDD |
| α | Viscosity parameter of the VDD |
| |$\dot{M}_{\rm ej}$| | Mass ejection rate of the O/B star |
| |$\dot{M}_{\rm acc}$| | Peak/outburst accretion rate in the Be-XRB |
| Lbol | Bolometric luminosity during outbursts |
| ϵ | Radiative efficiency |
| |$\dot{M}_{\rm Edd}$| | Eddington limit of accretion rate (equation 15) |
| η | |$\equiv \dot{M}_{\rm acc}/\dot{M}_{\rm Edd}$|, Eddington ratio during outbursts |
| fduty | Effective fraction of time the Be-XRB spends in outbursts |
| LX | Outburst X-ray luminosity for a certain band |
| ψX | Calibration parameter for the observed LX − Porb relation |
| fcorr | Correction factor for outburst luminosity (Section 3.2) |
| τ | Lifetime of the Be-XRB |
| Mtot | Total stellar mass underlying the Be-XRB population |
| |$\mathcal {N}_{\rm X}$| | Number of Be-XRBs in the outburst phase per unit SFR |
| |$\mathcal {L}_{\nu }$| | Specific X-ray luminosity per unit SFR |
| |$\mathcal {L}_{\rm X}$| | X-ray luminosity per unit SFR for a certain band |
| Z | Absolute metallicity (mass fraction of metals) |
| M1 | Initial primary mass |
| M2 | Initial secondary mass |
| a | Orbital separation (semimajor axis) |
| e | Orbital eccentricity |
| Porb | Orbital period |
| Ps | Spin period of the NS |
| MX | Compact object (NS/BH) mass |
| M⋆ | Mass of the donor star |
| R⋆ | Equatorial radius of the donor star |
| vKep | Equatorial Keplerian velocity of the donor star |
| vrot | Equatorial rotation velocity of the donor star |
| W | ≡ vrot/vKep with the initial value denoted by W0 |
| RL1 | Roche lobe size of the donor star at periastron (equation 6) |
| Rtrunc | ≡ ftrunca, average tidal truncation radius (equation 7) |
| Rcrit | VDD boundary beyond which gas flows are subsonic (equation 8) |
| cs | Sound speed in the ionised isothermal VDD |
| Σ0 | Base surface density of the VDD |
| α | Viscosity parameter of the VDD |
| |$\dot{M}_{\rm ej}$| | Mass ejection rate of the O/B star |
| |$\dot{M}_{\rm acc}$| | Peak/outburst accretion rate in the Be-XRB |
| Lbol | Bolometric luminosity during outbursts |
| ϵ | Radiative efficiency |
| |$\dot{M}_{\rm Edd}$| | Eddington limit of accretion rate (equation 15) |
| η | |$\equiv \dot{M}_{\rm acc}/\dot{M}_{\rm Edd}$|, Eddington ratio during outbursts |
| fduty | Effective fraction of time the Be-XRB spends in outbursts |
| LX | Outburst X-ray luminosity for a certain band |
| ψX | Calibration parameter for the observed LX − Porb relation |
| fcorr | Correction factor for outburst luminosity (Section 3.2) |
| τ | Lifetime of the Be-XRB |
| Mtot | Total stellar mass underlying the Be-XRB population |
| |$\mathcal {N}_{\rm X}$| | Number of Be-XRBs in the outburst phase per unit SFR |
| |$\mathcal {L}_{\nu }$| | Specific X-ray luminosity per unit SFR |
| |$\mathcal {L}_{\rm X}$| | X-ray luminosity per unit SFR for a certain band |
| Z | Absolute metallicity (mass fraction of metals) |
| M1 | Initial primary mass |
| M2 | Initial secondary mass |
| a | Orbital separation (semimajor axis) |
| e | Orbital eccentricity |
| Porb | Orbital period |
| Ps | Spin period of the NS |
| MX | Compact object (NS/BH) mass |
| M⋆ | Mass of the donor star |
| R⋆ | Equatorial radius of the donor star |
| vKep | Equatorial Keplerian velocity of the donor star |
| vrot | Equatorial rotation velocity of the donor star |
| W | ≡ vrot/vKep with the initial value denoted by W0 |
| RL1 | Roche lobe size of the donor star at periastron (equation 6) |
| Rtrunc | ≡ ftrunca, average tidal truncation radius (equation 7) |
| Rcrit | VDD boundary beyond which gas flows are subsonic (equation 8) |
| cs | Sound speed in the ionised isothermal VDD |
| Σ0 | Base surface density of the VDD |
| α | Viscosity parameter of the VDD |
| |$\dot{M}_{\rm ej}$| | Mass ejection rate of the O/B star |
| |$\dot{M}_{\rm acc}$| | Peak/outburst accretion rate in the Be-XRB |
| Lbol | Bolometric luminosity during outbursts |
| ϵ | Radiative efficiency |
| |$\dot{M}_{\rm Edd}$| | Eddington limit of accretion rate (equation 15) |
| η | |$\equiv \dot{M}_{\rm acc}/\dot{M}_{\rm Edd}$|, Eddington ratio during outbursts |
| fduty | Effective fraction of time the Be-XRB spends in outbursts |
| LX | Outburst X-ray luminosity for a certain band |
| ψX | Calibration parameter for the observed LX − Porb relation |
| fcorr | Correction factor for outburst luminosity (Section 3.2) |
| τ | Lifetime of the Be-XRB |
| Mtot | Total stellar mass underlying the Be-XRB population |
| |$\mathcal {N}_{\rm X}$| | Number of Be-XRBs in the outburst phase per unit SFR |
| |$\mathcal {L}_{\nu }$| | Specific X-ray luminosity per unit SFR |
| |$\mathcal {L}_{\rm X}$| | X-ray luminosity per unit SFR for a certain band |
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